Orders of magnitude (length)#10 nanometres

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To help compare different orders of magnitude, the following list describes various lengths between $1.6\; \backslash times\; 10^\{-35\}$ metres and $10^\{10^\{10^\{122\}\}\}$metres.

File:Size planets comparison.jpg

The {{vanchor|quectometre}} (SI symbol: {{vanchor|qm}}) is a unit of length in the metric system equal to {{nowrap|1=10⁻³⁰ metres}}.

To help compare different orders of magnitude, this section lists lengths shorter than 10⁻³⁰ m (1 qm).

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• 1.6 × 10⁻⁵ quectometres (1.6 × 10⁻³⁵ metres) – the Planck length (Measures of distance shorter than this do not make physical sense, according to current theories of physics.)
• 1 qm – 1 quectometre, the smallest named subdivision of the metre in the SI base unit of length, one nonillionth of a metre.

The {{vanchor|rontometre}} (SI symbol: {{vanchor|rm}}) is a unit of length in the metric system equal to {{nowrap|1=10⁻²⁷ metres}}.

• 1 rm – 1 rontometre, a subdivision of the metre in the SI base unit of length, one octillionth of a metre.

• 10 rm – the length of one side of a square whose area is one shed, a unit of target cross section used in nuclear physics

{{Anchor|Yoctometre}}

The {{vanchor|yoctometre}} (SI symbol: {{vanchor|ym}}) is a unit of length in the metric system equal to {{nowrap|1=10⁻²⁴ metres}}.

• 2 ym – the effective cross-section radius of 1 MeV neutrinos as measured by Clyde Cowan and Frederick Reines.{{cite web |first=Carl R. |last=Nave |url=http://hyperphysics.phy-astr.gsu.edu/hbase/particles/cowan.html#c1 |title=Cowan and Reines Neutrino Experiment |accessdate=2008-12-04}} ({{val|6.3|e=-44|u=cm2}}, which gives an effective radius of about {{val|2|e=-23|u=m}})

The {{vanchor|zeptometre}} (SI symbol: {{vanchor|zm}}) is a unit of length in the metric system equal to {{nowrap|1=10⁻²¹ metres}}.

To help compare different orders of magnitude, this section lists lengths between 10⁻²¹ m and 10⁻²⁰ m (1 zm and 10 zm).

• 2 zm – the upper bound for the width of a cosmic string in string theory.{{Citation needed|date=March 2018}}
• 2 zm – radius of effective cross section for a 20 GeV neutrino scattering off a nucleon
• 7 zm – radius of effective cross section for a 250{{Broken anchor|date=2024-05-26|bot=User:Cewbot/log/20201008/configuration|target_link=orders of magnitude (energy)#1E-9|reason= The anchor (1E-9) has been deleted.}} GeV neutrino scattering off a nucleon

To help compare different orders of magnitude, this section lists lengths between 10⁻²⁰ m and 10⁻¹⁹ m (10 zm and 100 zm).

To help compare different orders of magnitude, this section lists lengths between 10⁻¹⁹ m and 10⁻¹⁸ m (100 zm and 1 am).

• 177 zm – de Broglie wavelength of protons at the Large Hadron Collider (7 TeV as of 2010){{Citation needed|date=March 2018}}

The {{vanchor|attometre}} (SI symbol: {{vanchor|am}}) is a unit of length in the metric system equal to {{nowrap|1=10⁻¹⁸ metres}}.

To help compare different orders of magnitude, this section lists lengths between 10⁻¹⁸ m and 10⁻¹⁷ m (1 am and 10 am).

• 1 am – sensitivity of the LIGO detector for gravitational waves{{Citation needed|date=March 2018}}
• 1 am – upper limit for the size of quarks and electrons{{Citation needed|date=March 2018}}

To help compare different orders of magnitude, this section lists lengths between 10⁻¹⁷ m and 10⁻¹⁶ m (10 am and 100 am).

• 10–100 am – range of the weak force{{cite web |author=Christman, J. |year=2001 |title=The Weak Interaction |website=Physnet |publisher=Michigan State University |url=http://physnet2.pa.msu.edu/home/modules/pdf_modules/m281.pdf |url-status=dead |archive-url=https://web.archive.org/web/20110720004912/http://physnet2.pa.msu.edu/home/modules/pdf_modules/m281.pdf |archive-date=20 July 2011 |df=dmy-all}}
• 86 am – charge radius of a Bottom eta meson{{Cite journal|last1=Raya|first1=Khépani|last2=Bedolla|first2=Marco A.|last3=Cobos-Martínez|first3=J. J.|last4=Bashir|first4=Adnan|date=31 October 2017|title=Heavy quarkonia in a contact interaction and an algebraic model: mass spectrum, decay constants, charge radii and elastic and transition form factors|journal=Few-Body Systems|volume=59|issue=6|pages=16|url=https://ui.adsabs.harvard.edu/abs/2018FBS....59..133R/abstract|bibcode=2018FBS....59..133R|doi=10.1007/s00601-018-1455-y|arxiv=1711.00383|s2cid=254061694 }}

To help compare different orders of magnitude, this section lists lengths between 10⁻¹⁶ m and 10⁻¹⁵ m (100 am and 1 fm).

• 831 am – approximate proton radius{{cite journal|url=https://scientificamerican.com/article/how-big-is-the-proton-particle-size-puzzle-leaps-closer-to-resolution|title=How Big Is the Proton? Particle-Size Puzzle Leaps Closer to Resolution|last=Castelvecchi|first=Davide|journal=Nature |date=2019-11-11|volume=575 |issue=7782 |pages=269–270 |publisher=Scientific American|doi=10.1038/d41586-019-03432-4 |pmid=31719693 |bibcode=2019Natur.575..269C |access-date=3 July 2024|url-access=subscription}}{{cite journal |doi= 10.1038/nature09250 |title= The size of the proton |first1=Randolf |last1=Pohl |first2=Aldo |last2=Antognini |first3=François |last3=Nez |first4=Fernando D. |last4=Amaro |first5=François |last5=Biraben |first6=João M. R. |last6=Cardoso |first7=Daniel S. |last7=Covita |first8=Andreas |last8=Dax |first9=Satish |last9=Dhawan |first10=Luis M. P. |last10=Fernandes |first11=Adolf |last11=Giesen |first12=Thomas |last12=Graf |first13=Theodor W. |last13=Hänsch |first14=Paul |last14=Indelicato |first15=Lucile |last15=Julien |first16=Cheng-Yang |last16=Kao |first17=Paul |last17=Knowles |first18=Eric-Olivier |last18=Le Bigot |first19=Yi-Wei |last19=Liu |first20=José A. M. |last20=Lopes |first21=Livia |last21=Ludhova |author22=Cristina M. B. Monteiro |first23=Françoise |last23=Mulhauser |first24=Tobias |last24=Nebel |first25=Paul |last25=Rabinowitz |display-authors =etal |date= 8 July 2010|journal=Nature |volume=466 |issue= 7303 |pages =213–216 |pmid= 20613837 |bibcode=2010Natur.466..213P|s2cid= 4424731 |url= https://rdcu.be/bYa2m |url-access=subscription }}

The {{vanchor|femtometre}} (SI symbol: {{vanchor|fm}}) is a unit of length in the metric system equal to {{nowrap|1=10⁻¹⁵ metres}}.

In particle physics, this unit is sometimes called a fermi (unit), also with abbreviation "fm". To help compare different orders of magnitude, this section lists lengths between 10⁻¹⁵ metres and 10⁻¹⁴ metres (1 femtometre and 10 fm).

• 1 fm – diametre of a neutron, approximate range-limit of the color force carried between quarks by gluons
• 1.5 fm – diametre of the scattering cross section of an 11 MeV proton with a target proton
• 1.75 fm – the effective charge diametre of a proton{{cite web |url=https://physics.nist.gov/cgi-bin/cuu/Value?rp |website=The NIST Reference on Constants, Units, and Uncertainty |title=proton rms charge radius}}
• 2.81794 fm – classical electron radiusNIST. [http://physics.nist.gov/cgi-bin/cuu/Value?re CODATA Value: classical electron radius]. Retrieved 2009-02-10
• 3 fm – approximate range-limit of the nuclear binding force mediated by mesons
• 7 fm – the radius of the effective scattering cross section for a gold nucleus scattering a 6{{Broken anchor|date=2024-05-26|bot=User:Cewbot/log/20201008/configuration|target_link=orders of magnitude (energy)#1E-15|reason= The anchor (1E-15) has been deleted.}} MeV alpha particle over 140 degrees

To help compare different orders of magnitude, this section lists lengths between 10⁻¹⁴ m and 10⁻¹³ m (10 fm and 100 fm).

• 1.75 to 15 fm – diametre range of the atomic nucleus{{citation needed|date=March 2021}}
• 10 fm – the length of one side of a square whose area is one barn (10⁻²⁸ m²), a unit of target cross section used in nuclear physics
• 30.8568 fm – 1 quectoparsec (10⁻³⁰ parsecs)

To help compare different orders of magnitude, this section lists lengths between 10⁻¹³ m and 10⁻¹² m (100 fm and 1 pm).

• 570 fm – typical distance from the atomic nucleus of the two innermost electrons (electrons in the 1s shell) in the uranium atom, the heaviest naturally-occurring atom

The {{vanchor|picometre}} (SI symbol: pm) is a unit of length in the metric system equal to {{nowrap|1=10⁻¹² metres}} ({{nowrap|1={{sfrac|{{gaps|1|000|000|000|000}}}} m {{=}} 0.{{gaps|000|000|000|001}} m}}).

To help compare different orders of magnitude this section lists lengths between 10⁻¹² and 10⁻¹¹ m (1 pm and 10 pm).

• 1 pm – distance between atomic nuclei in a white dwarf{{Citation needed|date=March 2018}}
• 1 pm – reference value of particle displacement in acousticsISO 1683:2015
• 2.4 pm – the Compton wavelength of an electron
• 5 pm – shorter X-ray wavelengths (approx.)

To help compare different orders of magnitude this section lists lengths between 10⁻¹¹ and 10⁻¹⁰ m (10 pm and 100 pm).

• 25 pm – approximate radius of a helium atom, the smallest neutral atom{{cite web |first=Mark |last=Winter |title=WebElements Periodic Table of the Elements / Hydrogen / radii |url=http://www.webelements.com/hydrogen/atom_sizes.html |year=2008 |accessdate=2008-12-06| archiveurl= https://web.archive.org/web/20081218213512/http://www.webelements.com/hydrogen/atom_sizes.html| archivedate= 18 December 2008 }}{{cite web |first=Mark |last=Winter |title=WebElements Periodic Table of the Elements / Helium / radii |url=http://www.webelements.com/helium/atom_sizes.html |year=2008 |accessdate=2008-12-06| archiveurl= https://web.archive.org/web/20081219030040/http://www.webelements.com/helium/atom_sizes.html| archivedate= 19 December 2008 }}
• 30.8568 pm – 1 rontoparsec
• 50 pm – radius of a hydrogen atom
• 50 pm – bohr radius: approximate radius of a hydrogen atom
• ~50 pm – best resolution of a high-resolution transmission electron microscope
• 60 pm – radius of a carbon atom
• 93 pm – length of a diatomic carbon molecule
• 96 pm – H–O bond length in a water molecule

To help compare different orders of magnitude this section lists lengths between 10⁻¹⁰ and 10⁻⁹ m (100 pm and 1 nm; 1 Å and 10 Å).

• 100 pm – 1 ångström
• 100 pm – covalent radius of sulfur atom{{cite web |first=Mark |last=Winter |title=WebElements Periodic Table of the Elements / Sulfur / Radii |url=http://www.webelements.com/sulfur/atom_sizes.html |year=2008 |accessdate=2008-12-06| archiveurl= https://web.archive.org/web/20081211084435/http://www.webelements.com/sulfur/atom_sizes.html| archivedate= 11 December 2008 }}
• 120 pm – van der Waals radius of a neutral hydrogen atom{{cite web |first=Mark |last=Winter |title=WebElements Periodic Table of the Elements / Periodicity / Van der Waals radius / periodicity |url=http://www.webelements.com/periodicity/van_der_waals_radius/ |year=2008 |accessdate=2008-12-06| archiveurl= https://web.archive.org/web/20081219170602/http://www.webelements.com/periodicity/van_der_waals_radius/| archivedate= 19 December 2008 }}
• 120 pm – radius of a gold atom
• 126 pm – covalent radius of ruthenium atom
• 135 pm – covalent radius of technetium atom
• 150 pm – length of a typical covalent bond (C–C)
• 153 pm – covalent radius of silver atom
• 155 pm – covalent radius of zirconium atom
• 175 pm – covalent radius of thulium atom
• 200 pm – highest resolution of a typical electron microscope{{cite web|title=Resolution of an Electron Microscope |url=http://hypertextbook.com/facts/2000/IlyaSherman.shtml |archiveurl=https://web.archive.org/web/20090316071444/http://hypertextbook.com/facts/2000/IlyaSherman.shtml |archivedate=2009-03-16 |url-status=live |accessdate=2009-04-25 }}
• 225 pm – covalent radius of caesium atom
• 280 pm – average size of the water molecule
• 298 pm – radius of a caesium atom, calculated to be the largest atomic radius
• 340 pm – thickness of single layer graphene
• 356.68 pm – width of diamond unit cell
• 403 pm – width of lithium fluoride unit cell
• 500 pm – Width of protein α helix
• 543 pm – silicon lattice spacing
• 560 pm – width of sodium chloride unit cell
• 700 pm – width of glucose molecule
• 700 pm – diametre of a buckyball{{Cite web|url=http://www.chm.bris.ac.uk/motm/buckyball/c60a.htm|title=Buckminsterfullerene: Molecule of the Month|website=www.chm.bris.ac.uk|access-date=21 April 2019}}
• 780 pm – mean width of quartz unit cell
• 820 pm – mean width of ice unit cell
• 900 pm – mean width of coesite unit cell

The {{vanchor|nanometre}} (SI symbol: {{vanchor|nm}}) is a unit of length in the metric system equal to {{nowrap|1=10⁻⁹ metres}} ({{nowrap|1={{sfrac|{{gaps|1|000|000|000}}}} m {{=}} 0.{{gaps|000|000|001}} m}}).

To help compare different orders of magnitude, this section lists lengths between 10⁻⁹ and 10⁻⁸ m (1 nm and 10 nm).

• 1 nm – diametre of a carbon nanotube
• 1 nm – roughly the length of a sucrose molecule, calculated by Albert Einstein
• 2.3 nm – length of a phospholipid
• 2.3 nm – smallest gate oxide thickness in microprocessors
• 3 nm – width of a DNA helix
• 3 nm – flying height of the head of a hard disk
• 3 nm – the average half-pitch of a memory cell manufactured circa 2022
• 3.4 nm – length of a DNA turn (10 bp)
• 3.8 nm – size of an albumin molecule
• 5 nm – size of the gate length of a 16 nm processor
• 5 nm – the average half-pitch of a memory cell manufactured circa 2019–2020
• 6 nm – length of a phospholipid bilayer
• 6–10 nm – thickness of cell membrane
• 6.8 nm – width of a haemoglobin molecule
• 7 nm – diametre of actin filaments
• 7 nm – the average half-pitch of a memory cell manufactured circa 2018
• 10 nm – thickness of cell wall in Gram-negative bacteria

Image:Comparison semiconductor process nodes.svg is about 10 times that of the image.{{cite book|title=Industrial metrology|url=https://archive.org/details/industrialmetrol00mphi|url-access=limited|first=Graham T.|last=Smith|pages=[https://archive.org/details/industrialmetrol00mphi/page/n256 253]|publisher= Springer|year=2002|isbn=978-1-85233-507-6}}]]

To help compare different orders of magnitude this section lists lengths between 10⁻⁸ and 10⁻⁷ m (10 nm and 100 nm).

• 10 nm Shortest extreme ultraviolet wavelength or longest X-ray wavelength[http://pharmaxchange.info/press/2011/08/introduction-to-the-electromagnetic-spectrum-and-spectroscopy/ Introduction to the Electromagnetic Spectrum and Spectroscopy]
• 10 nm – the average length of a nanowire
• 10 nm – lower size of tobacco smokeAnnis, Patty J. October 1991. Kansas State University. Fine Particle POLLUTION. Figure 1. (tobacco smoke: 10 to {{val|1000|u=nm}}; virus particles: 3 to 50 nm; bacteria: 30 to {{val|30000|u=nm}}; cooking oil smoke: 30 to {{val|30000|u=nm}}; wood smoke: 7 to {{val|3000|u=nm}})
• 10 nm – the average half-pitch of a memory cell manufactured circa 2016 –2017
• 13 nm – the length of the wavelength that is used for EUV lithography
• 14 nm – length of a porcine circovirus
• 14 nm – the average half-pitch of a memory cell manufactured circa 2013
• 15 nm – length of an antibody
• 18 nm – diametre of tobacco mosaic virus{{cite book|title=Biochemistry|publisher=W.H. Freeman|year=1988|isbn=978-0-7167-1843-7|location=San Francisco|author=Stryer, Lubert|url-access=registration|url=https://archive.org/details/biochemistry3rdedi00stry}} {{citation needed span|text=(Generally, viruses range in size from 20 nm to 450 nm.)|date=February 2009}}
• 20 nm – length of a nanobe, could be one of the smallest forms of life
• 20–80 nm – thickness of cell wall in Gram-positive bacteria{{cite web|url=http://www.microbiologytext.com/index.php?module=Book&func=displayarticle&art_id=60|title=Through the Microscope|website=www.microbiologytext.com|access-date=21 May 2017|archive-date=12 June 2016|archive-url=https://web.archive.org/web/20160612050607/http://www.microbiologytext.com/index.php?module=book&func=displayarticle&art_id=60|url-status=dead}}
• 20 nm – thickness of bacterial flagellum{{cite book |vauthors=Kojima S, Blair D |title=The Bacterial Flagellar Motor: Structure and Function of a Complex Molecular Machine |journal=Int Rev Cytol |volume=233 |pages=93–134 |year=2004|pmid=15037363 |doi=10.1016/S0074-7696(04)33003-2 |series=International Review of Cytology |isbn=978-0-12-364637-8}}
• 22 nm – the average half-pitch of a memory cell manufactured circa 2011–2012
• 22 nm – smallest feature size of production microprocessors in September 2009{{cite web|url=https://phys.org/news/2009-09-law-intel.html|title=Moore's Law Marches on at Intel|publisher=Physorg.com|access-date=1 September 2018}}
• 25 nm – diametre of a microtubule
• 30 nm – lower size of cooking oil smoke
• 30.8568 nm – 1 yoctoparsec
• 32 nm – the average half-pitch of a memory cell manufactured circa 2009–2010
• 40 nm – extreme ultraviolet wavelength
• 45 nm – the average half-pitch of a memory cell manufactured circa 2007–2008
• 50 nm – upper size for airborne virus particles
• 50 nm – flying height of the head of a hard disk{{cite web|url=https://www.helpwithpcs.com/hardware/hard-drive-basics.php|title=Hard drive basics – Capacities, RPM speeds, interfaces and mechanics|website=www.helpwithpcs.com}}
• 65 nm – the average half-pitch of a memory cell manufactured circa 2005–2006
• 58 nm – height of a T7 bacteriophage
• 90 nm – human immunodeficiency virus (HIV) (generally, viruses range in size from 20 nm to 450 nm)
• 90 nm – the average half-pitch of a memory cell manufactured circa 2002–2003
• 100 nm – Length of a mesoporous silica nanoparticle

File:Comparison semiconductor process nodes.svg is about 10 times that of the image.{{cite book|title=Industrial metrology|url=https://archive.org/details/industrialmetrol00mphi|url-access=limited|first=Graham T.|last=Smith|page=[https://archive.org/details/industrialmetrol00mphi/page/n256 253]|publisher=Springer|year=2002|isbn=978-1-85233-507-6}}]]

To help compare different orders of magnitude, this section lists lengths between 10⁻⁷ and 10⁻⁶ m (100 nm and 1 μm).

• 100 nm – greatest particle size that can fit through a surgical mask{{Cite journal |doi = 10.1080/02786820802626355|title = Electrospray versus Nebulization for Aerosolization and Filter Testing with Bacteriophage Particles|journal = Aerosol Science and Technology|volume = 43|issue = 4|pages = 298–304|year = 2009|last1 = Eninger|first1 = Robert M.|last2 = Hogan|first2 = Christopher J.|last3 = Biswas|first3 = Pratim|last4 = Adhikari|first4 = Atin|last5 = Reponen|first5 = Tiina|last6 = Grinshpun|first6 = Sergey A.|bibcode = 2009AerST..43..298E|s2cid = 93465533}}
• 100 nm – 90% of particles in wood smoke are smaller than this.{{citation needed|date=December 2008}}
• 120 nm – greatest particle size that can fit through a ULPA filter{{cite web|url=https://www3.epa.gov/ttncatc1/dir1/ff-hepa.pdf|title=Air Pollution [Control] Technology Fact Sheet|publisher=United States Environmental Protection Agency|access-date=3 July 2024}}
• 120 nm – diametre of a human immunodeficiency virus (HIV){{cite book|url=https://books.google.com/books?id=51ozlZRBvQwC&pg=SL24-PA111|title=Textbook Of Pharmacology|last=Seth|date=18 November 2009|publisher=Elsevier India|via=Google Books|isbn=9788131211588}}
• 120 nm – approximate diametre of SARS-CoV-2{{Cite web|url=https://www.pptaglobal.org/media-and-information/ppta-statements/1055-2019-novel-coronavirus-2019-ncov-and-plasma-protein-therapies|title=New Coronavirus (SARS-CoV-2) and the Safety Margins of Plasma Protein Therapies – Plasma Protein Therapeutics Association (PPTA)|access-date=30 May 2020|archive-date=2 June 2020|archive-url=https://web.archive.org/web/20200602211857/https://www.pptaglobal.org/media-and-information/ppta-statements/1055-2019-novel-coronavirus-2019-ncov-and-plasma-protein-therapies|url-status=dead}}
• 125 nm – standard depth of pits on compact discs (width: 500 nm, length: 850 nm to 3.5 μm)
• 180 nm – typical length of the rabies virus
• 200 nm – typical size of a Mycoplasma bacterium, among the smallest bacteria
• 300 nm – greatest particle size that can fit through a HEPA (high efficiency particulate air) filter (N100 removes up to 99.97% at 300 nm, N95 removes up to 95% at 300 nm){{cite web|url=https://cdc.gov/niosh/docs/96-101/default.html|title=NIOSH Guide to the Selection and Use of Particulate Respirators|year=1996|publisher=Centers for Disease Control and Prevention|access-date=3 July 2024}}
• 300–400 nm – near ultraviolet wavelength
• 400–420 nm – wavelength of violet light (see Color and Visible spectrum)
• 420–440 nm – wavelength of indigo light
• 440–500 nm – wavelength of blue light
• 500–520 nm – wavelength of cyan light
• 520–565 nm – wavelength of green light
• 565–590 nm – wavelength of yellow light
• 590–625 nm – wavelength of orange light
• 625–700 nm – wavelength of red light
• 700–1.4 μm – wavelength of near-infrared radiation

File:Loxoceles reclusa iconized thread.png

The {{vanchor|micrometre}} (SI symbol: {{vanchor|μm}}) is a unit of length in the metric system equal to {{nowrap|1=10⁻⁶ metres}} ({{nowrap|1={{sfrac|{{gaps|1|000|000}}}} m {{=}} 0.{{gaps|000|001}} m}}).

To help compare different orders of magnitude, this section lists some items with lengths between 10⁻⁶ and 10⁻⁵ m (between 1 and 10 micrometres, or μm).

• ~0.7–300 μm – wavelength of infrared radiation
• 1 μm – the side of a square of area 10⁻¹² m²
• 1 μm – edge of cube of volume 10⁻¹⁸ m³ (1 fL)
• 1–10 μm – diametre of a typical bacterium{{citation needed|date=June 2016}}
• 1 μm – length of a lysosome
• 1–2 μm – anthrax spore{{cite journal|vauthors=Spencer RC|title=Bacillus anthracis|journal=Journal of Clinical Pathology|volume=56|issue=3|pages=182–7|date=March 2003|pmid=12610093|pmc=1769905|doi=10.1136/jcp.56.3.182}}
• 2 μm – length of an average E. coli bacteria
• 3–4 μm – size of a typical yeast cell{{cite journal|vauthors=Walker K, Skelton H, Smith K|title=Cutaneous lesions showing giant yeast forms of Blastomyces dermatitidis|journal=Journal of Cutaneous Pathology|volume=29|issue=10|pages=616–8|date=November 2002|pmid=12453301|doi=10.1034/j.1600-0560.2002.291009.x|s2cid=39904013}}
• 5 μm – length of a typical human spermatozoon's head{{cite journal|last=Smith|first=D.J.|title=Human sperm accumulation near surfaces: a simulation study|journal=Journal of Fluid Mechanics|year=2009|volume=621|page=295|doi=10.1017/S0022112008004953|url=http://eprints.maths.ox.ac.uk/860/1/human_sperm.pdf|access-date=20 May 2012|bibcode=2009JFM...621..289S|s2cid=3942426|archive-url=https://web.archive.org/web/20131106030353/http://eprints.maths.ox.ac.uk/860/1/human_sperm.pdf|archive-date=6 November 2013|url-status=dead}}
• 6 μm – thickness of the tape in a 120-minute (C120) compact cassette{{cite web|url=http://nactape.com/anablog/glossary|title=NAC Audio Cassette Glossary – Cassetro|website=nactape.com|language=en-US|access-date=16 March 2018}}
• 7 μm – diametre of the nucleus of a typical eukaryotic cell{{citation needed|date=June 2016}}
• about 7 μm – diametre of human red blood cells{{cite web|url=http://www.dnaftb.org/dnaftb/6/concept/index.html|title=Genes are real things :: DNA from the Beginning|website=www.dnaftb.org}}
• 3–8 μm – width of strand of spider web silk{{cite web|first=Gordon|last=Ramel|title=Spider Silk|url=http://www.earthlife.net/chelicerata/silk.html|quote=garden spider silk has a diametre of about 0.003 mm ... Dragline silk (about 0.00032 inch (0.008 mm) in Nephila)|access-date=4 December 2008|archive-url=https://web.archive.org/web/20081204080140/http://www.earthlife.net/chelicerata/silk.html|archive-date=4 December 2008 |url-status=live}}
• 5–10 μm – width of a chloroplast{{cite book|author1=Wise, R.R.|author2=Hoober, J.K.|year=2007|title=The Structure and Function of Plastids|publisher=Springer|isbn=978-1-4020-6570-5|url=https://books.google.com/books?id=FKeCVPbJ3asC|page=14}}
• 8–11 μm – size of a ground-level fog or mist droplet{{cite report|url=https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19940028559.pdf|title=Drop Size Distributions and Related Properties of Fog for Five Locations Measured From Aircraft|last=Zak|first=J. Allen|date=April 1994|publisher=NASA – Langley Research Center|location=Hampton, VA|docket=4585}}But not cloud or high-level fog droplets; droplet size increases with altitude. For a contradictory study indicating larger drop sizes even in ground fog, see {{cite journal|last=Eldridge|first=Ralph G.|date=October 1961|title=A Few Fog Drop-Size Distributions|journal=Journal of Meteorology|volume=18|issue=5|pages=671–6|doi=10.1175/1520-0469(1961)018<0671:AFFDSD>2.0.CO;2|bibcode=1961JAtS...18..671E|doi-access=free}}
• 7–12 μm – the diametre of human white blood cells
• 8–10 μm – the diametre of human macrophages

File:FogParticlesHighSpeed.jpg

To help compare different orders of magnitude, this section lists lengths between 10⁻⁵ m and 10⁻⁴ m (10 μm and 100 μm).

• 10 μm – width of cotton fibre{{cite web|author=IST – Innovative Sintering Technologies Ltd.|title=Fibreshape applications|url=http://www.istag.ch/fibres/applications.html|quote=Histogram of cotton thickness|access-date=4 December 2008}}
• 10 μm – tolerance of a Lego brick{{cite web|url=http://cache.lego.com/upload/contentTemplating/AboutUsFactsAndFiguresContent/otherfiles/download98E142631E71927FDD52304C1C0F1685.pdf|title=Company Profile, page 20|date=2010|publisher=The Lego Group|url-status=dead|archive-url=https://web.archive.org/web/20121209100137/http://cache.lego.com/upload/contentTemplating/AboutUsFactsAndFiguresContent/otherfiles/download98E142631E71927FDD52304C1C0F1685.pdf|archive-date=9 December 2012}}
• 10 μm – transistor width of the Intel 4004, the world's first commercial microprocessor
• 10 μm – mean longest dimension of a human red blood cell{{citation needed|date=September 2014}}
• 5–20 μm – dust mite excreta{{cite book|first=Morton|last=Lippmann|title=Environmental Toxicants: Human Exposures and Their Health Effects|publisher=John Wiley and Sons|year=2000|isbn=978-0-471-29298-2|url=https://books.google.com/books?id=7eCXlRbCeGAC|page=453|quote=20 μm .. 5 μm|access-date=4 December 2008}}
• 10.6 μm – wavelength of light emitted by a carbon dioxide laser
• 15 μm – width of silk fibre{{citation needed|date=September 2014}}
• 17 μm – minimum width of a strand of human hair
• 17.6 μm – one twip, a unit of length in typography
• 10 to 55 μm – width of wool fibre
• 25.4 μm – 1/1,000 inch, commonly referred to as 1 mil in the U.S. and 1 thou in the U.K.
• 30 μm – length of a human skin cell
• 30.8568 μm – 1 zeptoparsec
• 50 μm – typical length of Euglena gracilis, a flagellate protist{{cite journal|last=Rossi|first=Massimiliano|date=2017-11-27|title=Kinematics of flagellar swimming in Euglena gracilis: Helical trajectories and flagellar shapes|journal=Proceedings of the National Academy of Sciences of the United States of America|volume=114 |issue=50 |pages=13085–13090 |doi=10.1073/pnas.1708064114 |doi-access=free |pmid=29180429 |pmc=5740643 |bibcode=2017PNAS..11413085R |hdl=11384/84166 |hdl-access=free }}
• 50 μm – typical length of a human liver cell, an average-sized body cell{{citation needed|date=September 2014}}
• 50 μm – length of a silt particle
• 60 μm – length of a sperm cell
• 78 μm — width of a pixel on the display of the iPhone 4, marketed as Retina Display{{cite web|title=Apple – iPhone 4S – See everything clearly with the Retina display|url=https://www.apple.com/iphone/features/retina-display.html|work=Apple Inc. Official Website|publisher=Apple Inc.|accessdate=10 March 2012}}
• 70 to 180 μm – thickness of paper

File:Paramecium.jpg is around {{cvt|300| μm}} long.]]

To help compare different orders of magnitude, this section lists lengths between 10⁻⁴ m and 10⁻³ m (100 μm and 1 mm). The term myriometre (abbr. mom, equivalent to 100 micrometres; frequently confused with the myriametre, 10 kilometres){{cite book|url=https://books.google.com/books?id=XnRVDwAAQBAJ&pg=PA204|first=Jan|last=Gyllenbok|title=Encyclopedia of Historical Metrology, Weights, and Measures|publisher=Birkhäuser|year=2018|isbn=9783319575988}} is deprecated; the decimal metric prefix myrio- is obsolete and was not included among the prefixes when the International System of Units was introduced in 1960.

• 100 μm – 1/10 of a millimetre
• 100 μm – 0.00394 inches
• 100 μm – smallest distance that can be seen with the naked eye
• 100 μm – average diametre of a strand of human hair
• 100 μm – thickness of a coat of paint
• 100 μm – length of a dust particle
• 120 μm – the geometric mean of the Planck length and the diametre of the observable universe: {{radic|8.8 × 10²⁶ m × 1.6 × 10⁻³⁵ m}}
• 120 μm – diametre of a human ovum
• 170 μm – length of the largest mammalian sperm cell (rat){{cite web|url = http://www2.oakland.edu/biology/lindemann/spermfacts.htm |title = Sperm Facts|website = Dr. Charles Lindmann's Lab|publisher = Oakland University|last = Lindemann|first = Charles}}
• 170 μm – length of the largest sperm cell in nature, belonging to the Drosophila bifurca fruit fly{{cite web|url=https://files.oakland.edu/users/lindeman/web/spermfacts.htm|title=Dr. Charles Lindemann's Lab: Sperm Facts|first=Kim|last=Popiolek|publisher=Oakland University}}{{cite web|last1=Santoso|first1=Alex|title=World's Biggest Sperm Belongs to a Tiny Fly|url=https://www.neatorama.com/2006/06/17/worlds-biggest-sperm-belongs-to-a-tiny-fly/|website=Neatorama|date=17 June 2006}}
• 181 μm – maximum width of a strand of human hair
• 100–400 μm – length of Demodex mites living in human hair follicles
• 175–200 μm – typical thickness of a solar cell.
• 200 μm – typical length of Paramecium caudatum, a ciliate protist
• 200 μm – nominal width of the smallest commonly available mechanical pencil lead (0.2 mm)
• 250–300 μm – length of a dust mite{{cite web|archiveurl = https://web.archive.org/web/20011102080548/http://ohioline.osu.edu/hyg-fact/2000/2157.html|title = House Dust Mites|id= HYG-2157-97|last = Lyon|first = William F.|website = Ohio State University Extension| url = http://ohioline.osu.edu/hyg-fact/2000/2157.html|url-status = dead|archivedate= 2 November 2001}}
• 340 μm – length of a pixel on a 17-inch monitor with a resolution of 1024×768
• 500 μm – typical length of Amoeba proteus, an amoeboid protist
• 500 μm – MEMS micro-engine{{cite web|url=https://sandia.gov/app/uploads/sites/145/2021/11/4_5Designing.pdf|title=Designing and Operating Electrostatically Driven Microengines|last=Rodgers|first=Steven|publisher=Sandia National Laboratory|access-date=3 July 2024}}
• 500 μm – average length of a grain of sand
• 500 μm – average length of a grain of salt
• 500 μm – average length of a grain of sugar
• 560 μm – thickness of the central area of a human cornea
• 750 μm – diametre of a Thiomargarita namibiensis, the largest bacteria known{{cite news|url=http://www.cnn.com/NATURE/9904/15/biggest.bacteria/|title=CNN – Scientists discover biggest bacteria ever – April 15, 1999|website=www.cnn.com|access-date=20 May 2017}}
• 760 μm – thickness of an identification card

File:Fire ants 01.jpg is about {{cvt|5| mm}} long.]]

{{Redirect|1mm|the Perfume song|Level3 (Perfume album)|the measure|millimetre}}

The {{vanchor|millimetre}} (SI symbol: {{vanchor|mm}}) is a unit of length in the metric system equal to {{nowrap|1=10⁻³ metres}} ({{nowrap|1={{sfrac|{{gaps|1|000}}}} m {{=}} 0.001 m}}).

To help compare different orders of magnitude, this section lists lengths between 10⁻³ m and 10⁻² m (1 mm and 1 cm).

• 1.0 mm – 1/1,000 of a metre
• 1.0 mm – 0.03937 inches or 5/127 (exactly)
• 1.0 mm – side of a square of area 1 mm²
• 1.0 mm – diametre of a pinhead
• 1.5 mm – average length of a flea
• 2.54 mm – distance between pins on old dual in-line package (DIP) electronic components
• 5 mm – length of an average red ant
• 5 mm – diametre of an average grain of rice
• 5.56×45mm NATO – standard ammunition size
• 6 mm – approximate width of a pencil
• 7 mm – length of a Paedophryne amauensis, the smallest-known vertebrate{{cite news|url=https://news.nationalgeographic.com/news/2012/01/120111-smallest-frogs-vertebrates-new-species-science-animals/|archive-url=https://web.archive.org/web/20120113072722/http://news.nationalgeographic.com/news/2012/01/120111-smallest-frogs-vertebrates-new-species-science-animals/|url-status=dead|archive-date=13 January 2012|title=World's Smallest Frog Found—Fly-Size Beast Is Tiniest Vertebrate|date=13 January 2017|access-date=20 May 2017}}
• 7.1 mm – length of a sunflower seed
• 7.62×51mm NATO – common military ammunition size[http://www.dtic.mil/ndia/2008Intl/Arvidsson.pdf NATO Infantry Weapons Standardization, Per G. Arvidsson, ChairmanWeapons & Sensors Working GroupLand Capability Group 1 – Dismounted Soldier NATO Army Armaments Group] {{webarchive|url=https://web.archive.org/web/20121201183951/http://www.dtic.mil/ndia/2008Intl/Arvidsson.pdf|date=1 December 2012}} Accessed 29 April 2014
• 8 mm – width of old-format home movie film
• 8 mm – length of a Paedocypris progenetica, the smallest-known fish{{cite news|url=https://www.newscientist.com/article/mg18925363-000-worlds-smallest-vertebrate-has-a-big-secret/|title=World's smallest vertebrate has a big secret|work=New Scientist|access-date=20 May 2017|language=en-US}}

File:Fingernail label (enwiki).jpg is {{cvt|1| cm}} wide]]

{{redirect|10 mm|firearms cartridges|10 mm calibre}}

The {{vanchor|centimetre}} (SI symbol: {{vanchor|cm}}) is a unit of length in the metric system equal to {{nowrap|1=10⁻² metres}} ({{nowrap|1={{sfrac|100}} m {{=}} 0.01 m}}).

To help compare different orders of magnitude, this section lists lengths between 10⁻² m and 10⁻¹ m (1 cm and 1 dm).

• 1 cm – 10 millimetres
• 1 cm – 0.39 inches
• 1 cm – edge of a square of area 1 cm²
• 1 cm – edge of a cube of volume 1 mL
• 1 cm – length of a coffee bean
• 1 cm – approximate width of average fingernail
• 1.2 cm – length of a bee
• 1.2 cm – diametre of a die
• 1.5 cm – length of a very large mosquito
• 1.6 cm – length of a Jaragua Sphaero, a very small reptile
• 1.7 cm – length of a Thorius arboreus, the smallest salamander{{cite news|url=https://kids.mongabay.com/animals/smallest/smallest-salamander.html|title=The Smallest Salamander|work=Mongabay.com|access-date=20 May 2017|last=Lindstrom|first=Hannah}}
• 2 cm – approximate width of an adult human finger
• 2.54 cm – 1 inch
• 3.08568 cm – 1 attoparsec
• 3.4 cm – length of a quail egg{{cite news|url=https://www.backyardchickens.com/threads/comparing-quail-eggs.410632/|title=Comparing quail eggs|work=BackYard Chickens|access-date=20 May 2017|language=en-US}}
• 3.5 cm – width of film commonly used in motion pictures and still photography
• 3.78 cm – amount of distance the Moon moves away from Earth each year{{Cite news|date=1 February 2011|title=Why the Moon is getting further away from Earth|language=en-GB|work=BBC News|url=https://www.bbc.com/news/science-environment-12311119|access-date=5 November 2021}}
• 4.3 cm – minimum diametre of a golf ball{{cite web|title=USGA: Guide to the Rules on Clubs and Balls|url=http://www.usga.org/Rule-Books/Rules-on-Clubs-and-Balls/Appendix-III-%e2%80%93-The-Ball/|publisher=USGA|access-date=30 September 2011}}
• 5 cm – usual diametre of a chicken egg
• 5 cm – height of a hummingbird, the smallest-known bird
• 5.08 cm – 2 inches,
• 5.5 × 5.5 × 5.5 cm – dimensions of a 3x3x3 Rubik's cube
• 6.1 cm – average height of an apple
• 7.3–7.5 cm – diametre of a baseball
• 8.6 cm × 5.4 cm – dimensions of a standard credit card (also called CR80){{cite web|url=https://cardlogix.com/glossary/cr80|title=CR80 Card Specification|publisher=CardLogix Corporation|access-date=3 July 2024}}{{cite web |url=http://www.dimensionsguide.com/credit-card-dimensions/ |title=Credit Card Dimensions |accessdate=2011-09-30 }}
• 9 cm – length of a speckled padloper, the smallest-known turtle

{{Redirect|10cm|the band|10cm (band)}}

File:Foot_on_white_background.jpg

The {{vanchor|decimetre}} (SI symbol: {{vanchor|dm}}) is a unit of length in the metric system equal to {{nowrap|1=10⁻¹ metres}} ({{nowrap|1={{sfrac|10}} m {{=}} 0.1 m}}).

To help compare different orders of magnitude, this section lists lengths between 10 centimetres and 100 centimetres (10⁻¹ metre and 1 metre).

10 centimetres (abbreviated to 10 cm) is equal to:

• 1 decimetre (dm), a term not in common use (1 L = 1 dm³.)
• 100 millimetres
• 3.9 inches
• a side of a square of area 0.01 m²
• the edge of a cube with a volume of orders of magnitude (one cubic millimetre to one cubic metre) (1 L)

• 10 cm = 1.0 dm – wavelength of the highest UHF radio frequency, 3 GHz
• 12 cm = 1.2 dm – wavelength of the 2.45 GHz ISM radio band
• 21 cm = 2.1 dm – wavelength of the 1.4 GHz hydrogen emission line, a hyperfine transition of the hydrogen atom
• 100 cm = 10 dm – wavelength of the lowest UHF radio frequency, 300 MHz

• 10.16 cm = 1.016 dm – 1 hand used in measuring height of horses (4 inches)
• 12 cm = 1.2 dm – diametre of a compact disc (CD) (= 120 mm)
• 15 cm = 1.5 dm – length of a Bic pen with cap on
• 22 cm = 2.2 dm – diametre of a typical association football (soccer ball)
• 30 cm = 3 dm – typical school-use ruler length (= 300 mm)
• 30.48 cm = 3.048 dm – 1 foot (measure)
• 60 cm = 6 dm – standard depth (front to back) of a domestic kitchen worktop in Europe (= 600 mm)
• 90 cm = 9 dm – average length of a rapier, a fencing sword
• 91.44 cm = 9.144 dm – one yard (measure)

• 10 cm = 1 dm – diametre of the human cervix upon entering the second stage of labour
• 11 cm = 1.1 dm – length of an average potato in the U.S.
• 13 cm = 1.3 dm – body length of a Goliath birdeater
• 15 cm = 1.5 dm – approximate size of largest beetle species
• 19 cm = 1.9 dm – length of a banana
• 26.3 cm = 2.6 dm – length of average male human foot
• 29.98 cm = 2.998 dm – distance light in vacuum travels in one nanosecond
• 30 cm = 3.0 dm – maximum leg length of a Goliath birdeater
• 31 cm = 3.1 dm – wingspan of largest butterfly species Ornithoptera alexandrae
• 32 cm – length of the Goliath frog, the world's largest frog
• 46 cm = 4.6 dm – length of an average domestic cat
• 50 to 65 cm = 5–6.5 dm – a coati's tail
• 66 cm = 6.6 dm – length of the longest pine cones (produced by the sugar pine{{cite web|url=http://www.na.fs.fed.us/Spfo/pubs/silvics_manual/Volume_1/pinus/lambertiana.htm|title=Pinus lambertiana|first1=Bohun B. Jr.|last1=Kinloch|first2=William H.|last2=Scheuner|name-list-style=amp|archive-url=https://web.archive.org/web/20110608015717/http://www.na.fs.fed.us/Spfo/pubs/silvics_manual/Volume_1/pinus/lambertiana.htm|archive-date=8 June 2011 |url-status=live|access-date=1 May 2017}})

• 84 cm = 8.4 dm – approximate diametre of 2008 TS26, a meteoroid

{{Redirect|1m||1M (disambiguation){{!}}1M}}

File:Da Vinci Vitruve Luc Viatour.jpg within a square of side {{cvt|1.83| m}} and a circle about {{cvt|1.2| m}} in radius.]]

To help compare different orders of magnitude, this section lists lengths between one metre and ten metres.

Light, in vacuum, travels 1 metre in {{frac|1|299,792,458}}, or {{#expr:1/299792458}} of a second.

1 metre is:

• 10 decimetres
• 100 centimetres
• 1,000 millimetres
• 39.37 inches
• 3.28 feet
• 1.1 yards
• side of square with area 1 m²
• edge of cube with surface area 6 m² and volume 1 m³
• radius of circle with area π m²
• radius of sphere with surface area 4π m² and volume 4/3π m³

• 1 m – approximate height of the top part of a doorknob on a door
• 1 m – diametre of a very large beach ball
• 1 m — height of a typical washing machine
• 1.29 m – length of the Cross Island Chapel, the smallest church in the world
• 1.4 m – length of a Peel P50, the world's smallest car
• 1.435 m – standard gauge of railway track used by about 60% of railways in the world = 4 ft 8{{frac|1|2}} in
• 2 m — typical height of an average door
• 2.5 m – distance from the floor to the ceiling in an average residential house{{cite web|url=http://htwins.net/scale/|title=HTwins.net – The Scale of the Universe|website=htwins.net|access-date=20 May 2017|archive-url=https://web.archive.org/web/20101129182745/http://htwins.net/scale/|archive-date=29 November 2010|url-status=dead}}
• 2.7 m – length of the Starr Bumble Bee II, the smallest plane
• 2.77–3.44 m – wavelength of the broadcast radio FM band 87–108 MHz
• 3.05 m – the length of an old Mini
• 8 m – length of the Tsar Bomba, the largest bomb ever detonated
• 8.38 m – the length of a London Bus (AEC Routemaster)

• 2.44 m – height of an association football goal{{citation|title=Laws of the Game|url=http://resources.fifa.com/mm/document/footballdevelopment/refereeing/02/90/11/67/lawsofthegame2017-2018-en_neutral.pdf|publisher=FIFA|date=1 June 2017|access-date=21 March 2018|archive-date=13 November 2017|archive-url=https://web.archive.org/web/20171113060213/http://resources.fifa.com/mm/document/footballdevelopment/refereeing/02/90/11/67/lawsofthegame2017-2018-en_neutral.pdf|url-status=dead}}
• 2.45 m – highest high jump by a human (Javier Sotomayor){{citation|url=http://www.iaaf.org/statistics/toplists/inout=O/ageGroup=N/season=0/gender=M/discipline=HJ/legal=A/index.html|title=IAAF International Association of Athletics Federations – IAAF.org - Statistics - Top Lists|access-date=9 April 2010|archive-url=https://web.archive.org/web/20080116121100/http://www.iaaf.org/statistics/toplists/inout%3DO/ageGroup%3DN/season%3D0/gender%3DM/discipline%3DHJ/legal%3DA/index.html|archive-date=16 January 2008|url-status=dead}}
• 3.05 m – (10 feet) height of the basket in basketball
• 8.95 m – longest long jump by a human (Mike Powell){{citation|title=IAAF International Association of Athletics Federations – IAAF.org - Past Results|access-date=9 April 2010|url=http://www2.iaaf.org/results/past/WCH91/data/M/LJ/Rf.html|archive-url=https://web.archive.org/web/20110604191419/http://www2.iaaf.org/results/past/WCH91/data/M/LJ/Rf.html|archive-date=4 June 2011|url-status=dead}}

• 1 m – length of Rafflesia arnoldii, the largest flower in the world
• 1 m – height of Homo floresiensis (the "Hobbit")

• 1.15 m – a pizote (mammal)
• 1.5 m – height of an okapi
• 1.63 m – (5 feet 4 inches, or 64 inches) – height of average U.S. female human {{as of|2002|lc=on}} (source: U.S. Centers for Disease Control and Prevention (CDC))
• 1.75 m – (5 feet 8 inches) – height of average U.S. male human {{As of|2002|lc=on}} (source: U.S. CDC as per female above)
• 2.1 m - average height of a moose, the largest living deer
• 2.4 m – wingspan of a mute swan
• 2.5 m – height of a sunflower
• 2.5 m - average length of a black mamba, the second longest venomous snake and the longest venomous snake in Africa
• 2.7 m – length of a leatherback sea turtle, the largest living turtle
• 2.72 m – (8 feet 11 inches) – tallest-known human (Robert Wadlow)
• 3 m – length of a giant Gippsland earthworm
• 3 m – length of an Komodo dragon, the largest living lizard
• 3.3 m - wingspan of a Andean condor
• 3.63 m – the record wingspan for living birds (a wandering albatross)
• 3.7 m – leg span of a Japanese spider crab
• 3.7 m – length of a southern elephant seal, the largest living pinniped
• 4 m - average length of an king cobra, the longest venomous snake
• 5 m – length of an elephant
• 5.2 m – height of a giraffe{{citation|author=Dagg, A. I.|author-link=Anne Innis Dagg|year=1971|title=Mammalian Species 5|pages=1–8|edition=Giraffa camelopardalis}}
• 5.21 m - length of a green anaconda, the largest living snake
• 5.5 m – height of a Baluchitherium, the largest land mammal ever lived
• 6.5 m - length of an reticulated python, the longest living snake
• 6.5 m – wingspan of Argentavis, the largest flying bird known
• 6.7 m – length of a Microchaetus rappi
• 7.4 m – wingspan of Pelagornis, the bird with longest wingspan ever.{{Cite news |date=7 July 2014 |title=Fossil of 'largest flying bird' identified |language=en-GB |work=BBC News |url=https://www.bbc.com/news/science-environment-28164063 |access-date=19 July 2022}}
• 7.5 m – approximate length of the human gastrointestinal tract

• 3–6 m – approximate diametre of {{mpl|2003 SQ|222}}, a meteoroid
• 4.1 m – diametre of 2008 TC3, a small asteroid that flew into the Earth's atmosphere on 7 October 2008{{cite web|url=http://blogs.discovermagazine.com/badastronomy/2008/10/06/incoming-2/|title=Incoming!!!|last=Plait|first=P.|date=6 October 2008|publisher=Bad Astronomy|access-date=8 October 2008|archive-url=https://web.archive.org/web/20081007190747/http://blogs.discovermagazine.com/badastronomy/2008/10/06/incoming-2/|archive-date=7 October 2008|url-status=live}}

File:Image-Blue Whale and Hector Dolphine Colored.jpg has been measured as {{cvt|33| m}} long; this drawing compares its length to that of a human diver and a dolphin.]]

The {{vanchor|decametre}} (SI symbol: {{vanchor|dam}}) is a unit of length in the metric system equal to 10 metres (10¹ m).

To help compare different orders of magnitude, this section lists lengths between 10 and 100 metres.

10 metres (very rarely termed a decametre which is abbreviated as dam) is equal to:

• 10 metres
• 100 decimetres
• 1,000 centimetres
• 10,000 millimetres
• 10,000,000 micrometres (or rarely 10,000,000 microns)
• 32.8 feet
• 11 yards
• side of a square with area 100 m²

• 10 metres – wavelength of the highest shortwave radio frequency, 30 MHz
• 10.2 metres – length of the Panzer VIII Maus, the world's largest tank
• 12 metres – height of the Newby-McMahon Building, the world's littlest skyscraper
• 23 metres – height of Luxor Obelisk, located in the Place de la Concorde, Paris, France
• 25 metres – wavelength of the broadcast radio shortwave band at 12 MHz
• 29 metres – height of the Savudrija Lighthouse
• 30 metres – height of Christ the Redeemer
• 31 metres – wavelength of the broadcast radio shortwave band at 9.7 MHz
• 32 metres – length of one arcsecond of latitude on the surface of the Earth
• 33.3 metres – height of the De Noord, the tallest windmill in the world
• 34 metres – height of the Split Point Lighthouse in Aireys Inlet, Victoria, Australia
• 40 metres – wingspan of the Mil Mi-26, the largest helicopter
• 40 metres – average depth beneath the seabed of the Channel tunnel
• 49 metres – wavelength of the broadcast radio shortwave band at 6.1 MHz
• 50 metres – length of a road train
• 50 metres – height of the Arc de Triomphe
• 55 metres – height of the Leaning Tower of Pisa
• 62 metres – wingspan of Concorde
• 62.5 metres – height of Pyramid of Djoser
• 64 metres – wingspan of a Boeing 747-400
• 69 metres – wingspan of an Antonov An-124 Ruslan
• 70 metres – length of the Bayeux Tapestry
• 70 metres – width of a typical association football field
• 73 metres – wingspan of a Airbus A380
• 73 metres – height of the Taj Mahal
• 77 metres – wingspan of a Boeing 747-8
• 88.4 metres – wingspan of an Antonov An-225 Mriya transport aircraft
• 93 metres – height of the Statue of Liberty (Liberty Enlightening the World)
• 96 metres – height of Big Ben
• 100 metres – wavelength of the lowest shortwave radio frequency, 3 MHz

• 11 metres – approximate width of a doubles tennis court
• 15 metres – width of a standard FIBA basketball court
• 15.24 metres – width of an NBA basketball court (50 feet)
• 18.44 metres – distance between the front of the pitcher's rubber and the rear point of home plate on a baseball field (60 feet, 6 inches){{cite web|url=http://mlb.mlb.com/mlb/downloads/y2010/official_rules/2010_OfficialBaseballRules.pdf|title=Rule 1.04 The Playing Field|website=Official Baseball Rules|publisher=Major League Baseball|pages=1–5|date=25 January 2010|access-date=1 April 2011|archive-url=https://web.archive.org/web/20110427083014/http://mlb.mlb.com/mlb/downloads/y2010/official_rules/2010_OfficialBaseballRules.pdf|archive-date=27 April 2011 |url-status=live}} See especially Diagram No. 1, page 3.
• 20 metres – length of cricket pitch (22 yards){{cite web|url=http://www.lords.org/laws-and-spirit/laws-of-cricket/laws/law-7-the-pitch,33,AR.html|title=Law 7 (The pitch)|website=Laws of Cricket|publisher=Marylebone Cricket Club|date=October 2010|access-date=1 April 2011|archive-url=https://web.archive.org/web/20110514141304/http://www.lords.org/laws-and-spirit/laws-of-cricket/laws/law-7-the-pitch%2C33%2CAR.html|archive-date=14 May 2011|url-status=dead}}
• 27.43 metres – distance between bases on a baseball field (90 feet)
• 28 metres – length of a standard FIBA basketball court
• 28.65 metres – length of an NBA basketball court (94 feet)
• 49 metres – width of an American football field (53{{frac|1|3}} yards)
• 59.436 metres – width of a Canadian football field (65 yards)
• 70 metres – typical width of an association football field
• 91 metres – length of an American football field (100 yards, measured between the goal lines)

• 10 metres – average length of human digestive tract{{citation needed|date=November 2010}}
• 12 metres – height of a saguaro cactus
• 12 metres – length of a whale shark, largest living fish
• 12 metres – wingspan of a Quetzalcoatlus, a pterosaur
• 12.8 metres – length of a Titanoboa, the largest snake to have ever lived
• 13 metres – length of a giant squid and colossal squid, the largest living invertebrates
• 15 metres – approximate distance the tropical circles of latitude are moving towards the equator and the polar circles are moving towards the poles each year due to a natural, gradual decrease in the Earth's axial tilt
• 16 metres – length of a sperm whale, the largest toothed whale
• 18 metres – height of a Sauroposeidon, the tallest-known dinosaur
• 20 metres – length of a Leedsichthys, the largest-known fish to have lived
• 21 metres – height of High Force waterfall in England
• 30.5 metres – length of the lion's mane jellyfish, the largest jellyfish in the world
• 33 metres – length of a blue whale,{{cite web|url=http://nationalzoo.si.edu/Animals/AnimalRecords/|title=Animal Records|publisher=Smithsonian National Zoological Park|access-date=29 May 2007|archive-url=https://web.archive.org/web/20090328113538/http://nationalzoo.si.edu/Animals/AnimalRecords/|archive-date=28 March 2009|url-status=live}} the largest animal on earth, living or extinct, in terms of mass
• 39 metres – length of a Supersaurus, the longest-known dinosaur and longest vertebrate{{Cite web|last=Curtice|first=Brian|date=2021|title=New Dry Mesa Dinosaur Quarry Supersaurus vivianae (Jensen 1985) axial elements provide additional insight into its phylogenetic relationships and size, suggesting an animal that exceeded 39 metres in length|url=https://vertpaleo.org/wp-content/uploads/2021/10/SVP_2021_VirtualBook_final.pdf#page91}}
• 52 metres – height of Niagara Falls
• 55 metres – length of a bootlace worm, the longest-known animal{{cite web|url=https://www.guinnessworldrecords.com/world-records/longest-animal/|title=Longest Animal|publisher=Guinness World Records|access-date=15 June 2019}}
• 66 metres – highest possible sea level rise due to a complete melting of all ice on Earth
• 83 metres – height of a western hemlock
• 84 metres – height of General Sherman, the largest tree in the world

• 30 metres – diametre of {{mpl|1998 KY|26}}, a rapidly spinning meteoroid
• 30.8568 metres – 1 femtoparsec
• 32 metres – approximate diametre of 2008 HJ, a small meteoroid

File:Cheops pyramid 01.jpg

File:M27 DLS.JPG and location marker post on the M27 in Hampshire. The location marker posts are installed at 100-metre intervals.{{cite web

|url=http://www.highways.gov.uk/business/16049.htm

|title=Driver Location Signs – Frequently Asked Questions

|publisher=Highways Agency

|access-date=10 February 2010

|url-status=dead

|archive-url=http://webarchive.nationalarchives.gov.uk/20120810121037/http://www.highways.gov.uk/business/16049.htm

|archive-date=10 August 2012

}}]]

The {{vanchor|hectometre}} (SI symbol: {{vanchor|hm}}) is a unit of length in the metric system equal to 100 metres (10² m).

To compare different orders of magnitude this section lists lengths between 100 metres and 1,000 metres (1 kilometre).

100 metres (sometimes termed a hectometre) is equal to:

• 327.9

feet

• one side of a 1 hectare square
• a fifth of a modern li, a Chinese unit of measurement
• the approximate distance travelled by light in 300 nanoseconds

• 100 metres – wavelength of the highest medium wave radio frequency, 3 MHz
• 100 metres – spacing of location marker posts on British motorways
• 110 metres – height of the Saturn V
• 122 metres – height of the Starship, the tallest rocket currently under development by SpaceX
• 138.8 metres – height of the Great Pyramid of Giza (Pyramid of Cheops)
• 139 metres – height of the world's tallest roller coaster, Kingda Ka{{cite web|url=https://rcdb.com/2832.htm|title=Kingda Ka (Six Flags Great Adventure)|access-date=18 April 2009|archive-url=https://web.archive.org/web/20090326124600/http://www.rcdb.com/id2832.htm|archive-date=26 March 2009|url-status=live}}
• 157 metres – height of the Cologne Cathedral
• 162 metres – height of the Ulm Minster, the tallest church building in the world
• 165 metres – height of the Dushanbe Flagpole, the tallest flagpole from May 2011 to September 2014
• 169 metres – height of the Washington Monument
• 171 metres – height of the Jeddah Flagpole, the tallest flagpole from September 2014 to December 2021
• 182 metres – height of the Statue of Unity, the world's tallest statue
• 187 metres – shortest wavelength of the broadcast radio AM band, 1600 kHz
• 192 metres – height of the Gateway Arch
• 202 metres – height of the Cairo Flagpole, the tallest flagpole as of December 2021
• 202 metres – length of the Széchenyi Chain Bridge connecting Buda and Pest
• 220 metres – height of the Hoover Dam
• 245 metres – length of the LZ 129 Hindenburg
• 270 metres – length of the Titanic
• 318 metres – height of The New York Times Building
• 318.9 metres – height of the Chrysler Building
• 328 metres – height of Auckland's Sky Tower, the tallest free-standing structure in the Southern Hemisphere (1996–2022)
• 330 metres – height of the Eiffel Tower (including antenna){{Cite news|url=https://www.reuters.com/world/europe/eiffel-tower-grows-six-metres-after-new-antenna-attached-2022-03-15/|title=Eiffel Tower grows six metres after new antenna attached|website=Reuters |date=15 March 2022 }}
• 336 metres – height of the world's tallest bridge as of October 2023, the Millau Viaduct
• 364.75 metres – length of the Icon of the Seas
• 390 metres – height of the Empire State Building
• 400–800 metres – approximate heights of the world's tallest skyscrapers from 1931 to 2010
• 458 metres – length of the Knock Nevis, the world's largest supertanker
• 553.33 metres – height of the CN Tower,{{cite news|url=https://www.tripsavvy.com/how-tall-is-the-cn-tower-3251128|title=How Tall is the CN Tower?|work=TripSavvy|access-date=20 May 2017|last=Campbell|first=Marilyn|date=17 February 2018}} the tallest structure in North America
• 555 metres – longest wavelength of the broadcast radio AM band, 540 kHz
• 630 metres – height of the KVLY-TV mast, one of the tallest structures in the world
• 646 metres – height of the Warsaw radio mast, the world's tallest structure until its collapse in 1991
• 679 metres – height of Merdeka 118, the second tallest structure in Kuala Lumpur, Malaysia
• 828 metres – height of Burj Khalifa, world's tallest structure since 17 January 2009{{cite news|url=http://www.business24-7.ae/articles/2009/1/pages/01182009_63dc3a90c9a848219058be301f3f7ded.aspx|title=Burj Dubai all set for 09/09/09 soft opening|work=Emirates Business 24-7|access-date=17 January 2009|archive-url=https://web.archive.org/web/20090119161147/http://business24-7.ae/Articles/2009/1/Pages/01182009_63dc3a90c9a848219058be301f3f7ded.aspx|archive-date=19 January 2009 |url-status=live}}
• 1,000 metres – wavelength of the lowest mediumwave radio frequency, 300 kHz

• 100 metres – the distance a very fast human can run in about 10 seconds
• 100.584 metres – length of a Canadian football field between the goal lines (110 yards)
• 91.5 metres – 137 metres – length of a soccer field
• 105 metres – length of football pitch (UEFA stadium categories 3 and 4)
• 105 metres – length of a typical football field
• 109.73 metres – total length of an American football field (120 yards, including the end zones)
• 110–150 metres – the width of an Australian football field
• 135–185 metres – the length of an Australian football field
• 137.16 metres – total length of a Canadian football field, including the end zones (150 yards)

• 115.5 metres – height of the world's tallest tree in 2007, the Hyperion sequoia{{cite web|url=https://www.monumentaltrees.com/en/trees/coastredwood/coastredwood/|title=Tallest tree in the world: coast redwood|website=Monumental Trees, an inventory of big and old trees worldwide}}
• 310 metres – maximum depth of Lake Geneva
• 340 metres – distance sound travels in air at sea level in one second; see Speed of sound
• 947 metres – height of the Tugela Falls, the highest waterfall in Africa
• 979 metres – height of the Angel Falls, the world's highest free-falling waterfall (Venezuela)

• 270 metres – length of 99942 Apophis
• 535 metres – length of 25143 Itokawa,{{cite journal|vauthors=Fujiwara A, Kawaguchi J, Yeomans DK, Abe M, Mukai T, Okada T, Saito J, Yano H, Yoshikawa M, Scheeres DJ, Barnougin-Jha O, Cheng AF, Demura H, Gaskell RW, Hirata N, Ikeda H, Kominato T, Miyamoto H, Nakamura AM, Nakamura R, Sasaki S, Uesugi K|title=The rubble-pile asteroid Itokawa as observed by Hayabusa|journal=Science|volume=312|issue=5778|pages=1330–4|date=June 2006|pmid=16741107|doi=10.1126/science.1125841|bibcode=2006Sci...312.1330F|s2cid=206508294}} a small asteroid visited by a spacecraft

File:Fuji_Kawaguchi_357.JPG is {{Convert|3.776|km|mi}} high.]]

The {{vanchor|kilometre}} (SI symbol: {{vanchor|km}}) is a unit of length in the metric system equal to {{gaps|1|000}} metres (10³ m).

To help compare different orders of magnitude, this section lists lengths between 1 kilometre and 10 kilometres (10³ and 10⁴ metres).

1 kilometre (unit symbol km) is equal to:

• 1,000 metres
• 0.621371 miles
• 1,093.61 yards
• 3,280.84 feet
• 39,370.1 inches
• 100,000 centimetres
• 1,000,000 millimetres
• Side of a square of area 1 km²
• Radius of a circle of area π km²

• 1 km – wavelength of the highest long wave radio frequency, 300 kHz{{cite web|url=https://en.oxforddictionaries.com/definition/long_wave|archive-url=https://web.archive.org/web/20190301140144/https://en.oxforddictionaries.com/definition/long_wave|url-status=dead|archive-date=1 March 2019|title=long wave|publisher=Oxford Dictionaries|quote=wavelength above one kilometre (and a frequency below 300 kHz)|access-date=12 March 2011}}
• 1.008 km – proposed height of the Jeddah Tower, a megatall skyscraper under construction in Saudi Arabia
• 1.280 km – span of the Golden Gate Bridge (distance between towers){{cite web|title=Bridge Design and Construction Statistics |website=Golden Gate Bridge |url=http://goldengatebridge.org/research/factsGGBDesign.php#length|access-date=10 June 2012 |url-status=dead |archive-url= https://web.archive.org/web/20120614021631/http://goldengatebridge.org/research/factsGGBDesign.php#length |archive-date= Jun 14, 2012 }}
• 1.609 km – 1 statute mile
• 1.852 km – 1 nautical mile, equal to 1 arcminute of latitude at the surface of the Earth{{cite Merriam-Webster|nautical mile|access-date=12 March 2011}}
• 1.991 km – span of the Akashi Kaikyō Bridge{{citation|title=Akashi Kaikyo Bridge @ Everything2.com|url=https://everything2.com/title/Akashi%2520Kaikyo%2520Bridge|publisher=Everything2|date=9 September 2002|access-date=19 April 2009}}
• 2.309 km – axial length of the Three Gorges Dam, the largest dam in the world located in China
• 3.991 km – length of the Akashi Kaikyō Bridge, longest suspension bridge in the world {{as of|2008|December|lc=on}}{{citation|title=Supporting the Longest Suspension Bridge in the World|url=http://regex.info/blog/2008-12-09/1021|first=Jeffrey|last=Friedl|date=9 December 2008|access-date=19 April 2009|archive-url=https://web.archive.org/web/20090303135910/http://regex.info/blog/2008-12-09/1021|archive-date=3 March 2009|url-status=live}}
• 4 km – width of Central Park
• 5.072 km – elevation of Tanggula Mountain Pass, below highest peak in the Tanggula Mountains, highest railway pass in the world {{as of|2005|08|lc=on}}{{citation|title=New height of world's railway born in Tibet|url=http://news.xinhuanet.com/english/2005-08/24/content_3397297.htm|publisher=Xinhua News Agency|date=24 August 2005|access-date=19 April 2009|archive-url=https://web.archive.org/web/20090603005131/http://news.xinhuanet.com/english/2005-08/24/content_3397297.htm|archive-date=3 June 2009|url-status=dead}}
• 5.8 km – elevation of Cerro Aucanquilcha, highest road in the world, located in Chile{{cite web|url=http://andes.org.uk/peak-info-6000/aucanquilcha-info.asp|title=Aucanquilcha 6176m|work=Andes|access-date=3 July 2024}}
• 98 airports have paved runways from 4 km to 5.5 km in length.
• 8 km – length of Palm Jebel Ali, an artificial island built off the coast of Dubai
• 9.8 km – length of The World, an artificial archipelago that is also built off the coast of Dubai, whose islands resemble a world map

• 1.5 km – distance sound travels in water in one second

{{More citations needed section|date=March 2011|reason=each needs a cite, to aid verification}}

{{See also|List of highest mountains on Earth}}

• 1.637 km – deepest dive of Lake Baikal in Russia, the world's largest freshwater lake{{cite news|url=http://news.bbc.co.uk/2/hi/europe/7530230.stm|title=Russians in landmark Baikal dive|date=29 July 2008|work=BBC News|quote=current record of 1,637m was set in Lake Baikal in the 1990s|access-date=12 March 2011}}
• 2.228 km – height of Mount Kosciuszko, highest point on mainland Australia{{cite web|title=Kosciuszko National Park lookouts and scenery|url=https://www.nationalparks.nsw.gov.au/visit-a-park/parks/kosciuszko-national-park#WallacesCreeklookout|publisher=Office of Environment & Heritage: NSW National Parks & Wildlife Service}}
• Most of Manhattan is from 3 to 4 km wide.
• 3.776 km – height of Mount Fuji, highest peak in Japan
• 4.478 km – height of Matterhorn
• 4.509 km – height of Mount Wilhelm, highest peak in Papua New Guinea
• 4.810 km – height of Mont Blanc, highest peak in the Alps
• 4.884 km – height of Carstensz Pyramid, highest peak in Oceania{{cite web|title=Carstensz Pyramid details|url=http://carstenszpyramid.org/|publisher=Carstensz Pyramid Site|url-status=dead|archive-url=https://web.archive.org/web/20141216212851/http://carstenszpyramid.org/|archive-date=16 December 2014}}
• 4.892 km – height of Mount Vinson, highest peak in Antarctica
• 5.610 km – height of Mount Damavand, highest peak in Iran
• 5.642 km – height of Mount Elbrus, highest peak in Europe
• 5.895 km – height of Mount Kilimanjaro, highest peak in Africa
• 6.081 km – height of Mount Logan, highest peak in Canada
• 6.190 km – height of Denali, highest peak in North America
• 6.959 km – height of Aconcagua, highest peak in South America
• 7.5 km – depth of Cayman Trench, deepest point in the Caribbean Sea
• 8.611 km – height of K2, second highest peak on Earth
• 8.848 km – height of Mount Everest, highest peak on Earth, on the border between Nepal and China

• 1 km – diametre of 1620 Geographos
• 1 km – very approximate size of the smallest-known moons of Jupiter
• 1.4 km – diametre of Dactyl, the first confirmed asteroid moon
• 4.8 km – diametre of 5535 Annefrank, an inner belt asteroid
• 5 km – diametre of 3753 Cruithne
• 5 km – length of PSR B1257+12
• 8 km – diametre of Themisto, one of Jupiter's moons
• 8 km – diametre of the Vela Pulsar
• 8.6 km – diametre of Callirrhoe, also known as Jupiter XVII
• 9.737 km – length of PSR B1919+21

File:Strait of Gibraltar 5.53940W 35.97279N.jpg is {{cvt|13| km}} wide.]]

To help compare different orders of magnitude, this section lists lengths between 10 and 100 kilometres (10⁴ to 10⁵ metres). The myriametre{{cite web|url=http://home.fonline.de/fo0126/geschichte/groessen/mas10.htm|title=Königreich Frankreich|author-last=Appell|author-first=Wolfgang|date=16 September 2009|website=Amtliche Maßeinheiten in Europa 1842 [Official units of measure in Europe 1842]|language=de|trans-title=Kingdom of France|orig-year=2002|url-status=dead|archive-url=https://web.archive.org/web/20111005102232/http://home.fonline.de/fo0126/geschichte/groessen/mas10.htm|archive-date=5 October 2011}} (Website based on Alte Meß- und Währungssysteme aus dem deutschen Sprachgebiet, {{ISBN|3-7686-1036-5}}) (sometimes also spelled myriometre; 10,000 metres) is a deprecated unit name; the decimal metric prefix myria-{{cite web|title=La Loi Du 18 Germinal An 3 – Décision de tracer le mètre, unité fondamentale, sur une règle de platine. Nomenclature des "mesures républicaines". Reprise de la triangulation|url=http://histoire.du.metre.free.fr/fr/Pages/Sommaire/06.htm|language=fr|publisher=histoire.du.metre.free.fr|access-date=12 October 2015}} (sometimes also written as myrio-{{cite book|title=The Edinburgh Encyclopædia|author-first=David|author-last=Brewster|volume=12|date=1830|location=Edinburgh, UK|publisher=William Blackwood, John Waugh, John Murray, Baldwin & Cradock, J. M. Richardson|page=494|url=https://books.google.com/books?id=0bIkTUZAbxcC|access-date=9 October 2015}}{{cite book|title=The Edinburgh Encyclopaedia|author-first=David|author-last=Brewster|volume=12|edition=1st American|date=1832|publisher=Joseph and Edward Parker|url=https://books.google.com/books?id=17RGAQAAIAAJ&pg=PA572|access-date=9 October 2015}}{{cite book|title=Polytechnisches Journal|author-first=Johann Gottfried|author-last=Dingler|volume=11|date=1823|publisher=J.W. Gotta'schen Buchhandlung|language=de|location=Stuttgart, Germany|url=https://books.google.com/books?id=wF3zAAAAMAAJ&pg=PA500|access-date=9 October 2015}}) is obsolete{{citation |title=Procès-Verbaux des Séances|author=Comité International des Poids et Mesures|author-link=Comité International des Poids et Mesures|publisher=Gauthier-Villars, imprimeur-libraire du Bureau des Longitudes, de l'École Polytechnique|location=Paris, France|language=fr|edition=2|volume=17|date=1935|page=76}}{{cite book|title=Metric System of Weights and Measures – Guidelines for Use|author-first=Richard W.|author-last=Roberts|publisher=Director of the National Bureau of Standards|location=US|id=Federal Register FR Doc.75-15798 (18 June 1975)|date=1 June 1975|quote=Accordingly, the following units and terms listed in the table of metric units in section 2 of the act of 28 July 1866, that legalized the metric system of weights and measures in the United States, are no longer accepted for use in the United States: myriametre, stere, millier or tonneau, quintal, myriagram, kilo (for kilogram).}}{{cite book|title=Weights and Measures Standards of the United States, a brief history|author-first=Lewis V.|author-last=Judson|others=Derived from a prior work by Louis A. Fisher (1905)|editor-first=Louis E.|editor-last=Barbrow|publisher=US Department of Commerce, National Bureau of Standards|location=US|date=1 October 1976|orig-year=1963|id=NBS Special Publication 447; NIST SP 447; 003-003-01654-3|lccn=76-600055|page=33|chapter=Appendix 7|chapter-url=https://www.nist.gov/pml/wmd/pubs/upload/sp-447-2.pdf|access-date=12 October 2015|archive-date=4 March 2016|archive-url=https://web.archive.org/web/20160304193400/http://www.nist.gov/pml/wmd/pubs/upload/sp-447-2.pdf|url-status=dead}} and was not included among the prefixes when the International System of Units was introduced in 1960.

10 kilometres is equal to:

File:Myriameterstein36RüdesheimRhein.JPG on the Rhine: 36 (XXXVI) myriametres from Basel. The stated distance is {{cvt|360| km}}; the comma is the decimal separator in Germany.]]

• 10,000 metres
• About 6.2 miles
• 1 mil (the Scandinavian mile), now standardized as 10 km:
• 1 mil, the unit of measure commonly used in Norway and SwedenHaugen, Einar, Norwegian English Dictionary, 1965, Oslo: Universitetsforlaget and Madison: University of Wisconsin Press, s.v. mil used to be 11,295 m in Norway and 10,688 m in Sweden.
• farsang, unit of measure commonly used in Iran and Turkey{{cite web|url=https://sizes.com/units/farsakh.htm|title=What is a farsakh or farsang?|website=sizes.com}}

• 42.195 km – length of the marathon{{cite web|url=http://www.iaaf.org/mm/Document/imported/42192.pdf|title=IAAF Competition Rules 2008|page=195|publisher=IAAF|access-date=20 April 2009|archive-url=https://web.archive.org/web/20090325001003/http://www.iaaf.org/mm/Document/imported/42192.pdf|archive-date=25 March 2009|url-status=live}}

• 18 km – cruising altitude of Concorde
• 27 km – circumference of the Large Hadron Collider, {{as of|May 2010|lc=on}} the largest and highest energy particle accelerator
• 34.668 km – highest manned balloon flight (Malcolm D. Ross and Victor E. Prather on 4 May 1961){{cite web|url=http://stratocat.com.ar/artics/stratolab-e.htm|title=Stratolab, an Evolutionary Stratospheric Balloon Project|first=Gregory|last=Kennedy}}
• 38.422 km – length of the Second Lake Pontchartrain Causeway in Louisiana, U.S.
• 39 km – undersea portion of the Channel tunnel
• 53.9 km – length of the Seikan Tunnel, {{as of|2009|10|lc=on}}, the longest rail tunnel in the world{{cite web|title=Turkey Building the World's Deepest Immersed Tube Tunnel|url=https://www.popularmechanics.com/technology/design/a1689/4217338/|first=Jeff|last=Wise|website=Popular Mechanics|date=1 October 2009|access-date=1 May 2017}}
• 77 km – rough total length of the Panama Canal{{Cite web | url=http://panamacanalfacts.com/facts-about-the-panama-canal/ | archive-url=https://web.archive.org/web/20160314232748/http://panamacanalfacts.com/facts-about-the-panama-canal/ | url-status=dead | archive-date=14 March 2016 | title=Facts and History about the Panama Canal}}

• 10 km – height of Mauna Kea in Hawaii, measured from its base on the ocean floor
• 11 km – deepest-known point of the ocean, Challenger Deep in the Mariana Trench
• 11 km – average height of the troposphere
• 14 km – width of the Strait of Gibraltar
• 21 km – length of Manhattan
• 22 km – narrowest width of the Cook Strait between New Zealand's main islands
• 23 km – depth of the largest earthquake ever recorded in the United Kingdom, in 1931 at the Dogger Bank of the North Sea
• 34 km – narrowest width of the English Channel at the Strait of Dover
• 50 km – approximate height of the stratosphere
• 90 km – width of the Bering Strait

• 10 km – diametre of the most massive neutron stars (3–5 solar masses)
• 13 km – mean diametre of Deimos, the smaller moon of Mars
• 20 km – diametre of the least massive neutron stars (1.44 solar masses)
• 20 km – diametre of Leda, one of Jupiter's moons
• 20 km – diametre of Pan, one of Saturn's moons
• 22 km – diametre of Phobos, the larger moon of Mars
• 27 km – height of Olympus Mons above the Mars reference level,[http://quest.arc.nasa.gov/mars/ask/terrain-geo/highest_and_lowest_points_on_Mars.txt Highest and lowest points on Mars] {{webarchive|url=https://web.archive.org/web/20160131060040/http://quest.arc.nasa.gov/mars/ask/terrain-geo/highest_and_lowest_points_on_Mars.txt|date=31 January 2016}} NASA{{cite web|url=http://quest.arc.nasa.gov/mars/ask/terrain-geo/Height_of_Martian_vs__Earth_mountains.txt|title=Height of Martian vs. Earth mountains|last=Plescia|first=Jeff|date=1 October 1997|website=Questions and Answers about Mars terrain and geology|access-date=20 April 2009|archive-url=https://web.archive.org/web/20081014140612/http://quest.arc.nasa.gov/mars/ask/terrain-geo/Height_of_Martian_vs__Earth_mountains.txt|archive-date=14 October 2008|url-status=dead}} the highest-known mountain of the Solar System
• 30.8568 km – 1 picoparsec
• 43 km – diametre difference of Earth's equatorial bulge
• 66 km – diametre of Naiad, the innermost of Neptune's moons

File:Suez canal 30.55N 32.28E.jpg is {{cvt|163| km}} long.]]

A length of 100 kilometres (about 62 miles), as a rough amount, is relatively common in measurements on Earth and for some astronomical objects.

It is the altitude at which the FAI defines spaceflight to begin.

To help compare orders of magnitude, this section lists lengths between 100 and 1,000 kilometres (10⁵ and 10⁶ metres).

A distance of 100 kilometres is equal to about 62 miles (or {{convert|100|km|8|disp=out|abbr=in}}).

• 100 km – the Karman line: the internationally recognized boundary of outer space
• 105 km – distance from Giridih to Bokaro
• 109 km – length of High Speed 1 between London and the Channel Tunnel{{cite web|title=High Speed 1 Project Hoem|url=https://www.bechtel.com/projects/high-speed-1/|website=www.betchel.com|publisher=Betchel Corporation|access-date=8 February 2015}}
• 130 km – range of a Scud-A missile
• 163 km – length of the Suez Canal
• 164 km – length of the Danyang–Kunshan Grand Bridge
• 213 km – length of Paris Métro
• 217 km – length of the Grand Union Canal
• 223 km – length of the Madrid Metro
• 300 km – range of a Scud-B missile
• 386 km – altitude of the International Space Station
• 408 km – length of the London Underground (active track)
• 460 km – distance from London to Paris
• 470 km – distance from Dublin to London as the crow flies
• 600 km – range of a Scud-C missile
• 600 km – height above ground of the Hubble Space Telescope
• 804.67 km – (500 miles) distance of the Indy 500 automobile race

• 42 km – width of Singapore
• 75 km – width of Rhode Island
• 111 km – distance covered by one degree of latitude on Earth's surface
• 120 km – width of Brunei
• 180 km – distance between Mumbai and Nashik
• 200 km – width of Qatar
• 203 km – length of Sognefjorden, the third-largest fjord in the world
• 220 km – distance between Pune and Nashik
• 240 km – width of Rwanda
• 240 km – widest width of the English Channel
• 400 km – width of West Virginia
• 430 km – length of the Pyrenees
• 450 km – length of the Grand Canyon
• 500 km – widest width of Sweden from east to west
• 501 km – width of Uganda
• 550 km – distance from San Francisco to Los Angeles as the crow flies
• 560 km – distance of Bordeaux–Paris, formerly{{When|date=April 2010}} the longest one-day professional cycling race{{cite web|title=Bordeaux-Paris | the event|url=http://www.bordeauxparis.com/en/the-event/|website=www.bordeauxparis.com|access-date=30 April 2017|archive-url=https://web.archive.org/web/20170328181843/http://www.bordeauxparis.com/en/the-event/|archive-date=28 March 2017|url-status=dead}}
• 590 km – length of land boundary between Finland and Sweden
• 724 km – length of the Om River
• 800 km – width of Germany
• 871 km – distance from Sydney to Melbourne (along the Hume Highway)
• 897 km – length of the River Douro
• 900 km – distance from Berlin to Stockholm
• 956 km – distance from Washington, D.C., to Chicago, Illinois, as the crow flies
• 970 km – distance from Land's End to John o' Groats as the crow flies

• 100 km – the altitude at which the FAI defines spaceflight to begin
• 167 km – diametre of Amalthea, one of Jupiter's inner moons
• 200 km – width of Valles Marineris
• 220 km – diametre of Phoebe, the largest of Saturn's outer moons
• 300 km – the approximate distance travelled by light in one millisecond
• 340 km – diametre of Nereid, the third-largest moon of Neptune which has a highly elliptical orbit
• 350 km – lower bound of Low Earth orbit
• 420 km – diametre of Proteus, the second-largest moon of Neptune
• 468 km – diametre of the asteroid 4 Vesta
• 472 km – diametre of Miranda, one of Uranus's major moons
• 974.6 km – greatest diametre of 1 Ceres, the largest Solar System asteroid

File:1e6m comparison Mars Mercury Moon Pluto Haumea - no transparency.png and dwarf planets in the Solar System have diametres from one to ten million metres. Top row: Mars (left), Mercury (right); bottom row: Moon (left), Pluto (center), and Haumea (right), to scale.]]

The {{vanchor|megametre}} (SI symbol: {{vanchor|Mm}}) is a unit of length in the metric system equal to {{gaps|1|000|000}} metres (10⁶ m).

To help compare different orders of magnitude, this section lists lengths starting at 10⁶ m (1 Mm or 1,000 km).

1 megametre is equal to:

• 1000 km
• {{val|e=6|u=m}} (one million metres)
• approximately 621.37 miles

• 2.100 Mm – length of proposed Iran-Pakistan-India gas pipe
• 2.100 Mm – distance from Casablanca to Rome
• 2.288 Mm – length of the official Alaska Highway when it was built in the 1940s{{cite web|title=FAQ-Alaska Highway Facts|publisher=The MILEPOST|url=http://www.milepost.com/faq/hwy_drivingfacts.shtml|archive-url=https://web.archive.org/web/20070929182939/http://www.milepost.com/faq/hwy_drivingfacts.shtml|archive-date=29 September 2007|quote=1,390 miles ... Alaska Route 2 and often treated as a natural extension of the Alaska Highway|access-date=25 August 2007}}
• 3.069 Mm – length of Interstate 95 (from Houlton, Maine, to Miami, Florida)
• 3.846 Mm – length of U.S. Route 1 (from Fort Kent, Maine, to Key West, Florida)
• 5.000 Mm – width of the United States
• 5.007 Mm – estimated length of Interstate 90 (Seattle, Washington, to Boston, Massachusetts)
• 5.614 Mm – length of the Australian Dingo Fence{{cite encyclopedia|first1=R.J.|last1=Downward|last2=Bromell|first2=J.E.|chapter=The development of a policy for the management of dingo populations in South Australia|title=Proceedings of the Fourteenth Vertebrate Pest Conference 1990|publisher=University of Nebraska–Lincoln|date=March 1990|chapter-url=http://digitalcommons.unl.edu/vpc14/23/|access-date=31 August 2009|archive-url=https://archive.today/20240524113343/https://www.webcitation.org/5jXGkvGsS?url=http://digitalcommons.unl.edu/vpc14/23/|archive-date=24 May 2024|url-status=live}}
• 6.371 Mm – global-average Earth radius
• 6.4 Mm – length of the Great Wall of China
• 7.821 Mm – length of the Trans-Canada Highway, the world's longest national highway (from Victoria, British Columbia, to St. John's, Newfoundland)
• 8.836 Mm – road distance between Prudhoe Bay, Alaska, and Key West, Florida, the endpoints of the U.S. road network
• 8.852 Mm – aggregate length of the Great Wall of China, including trenches, hills and rivers{{cite web|url=https://www.google.com/hostednews/afp/article/ALeqM5hZntU8l3vH1I21vcievtc-QIryLA|title=China's Great Wall far longer than thought: survey|publisher=AFP|date=20 April 2009|access-date=20 April 2009|archive-url=https://web.archive.org/web/20090427193631/https://www.google.com/hostednews/afp/article/ALeqM5hZntU8l3vH1I21vcievtc-QIryLA|archive-date=27 April 2009 |url-status=dead}}
• 9.259 Mm – length of the Trans-Siberian railway[http://www.poezda.net/en/train_timetable?tr_code=898975%3A%C0 CIS railway timetable], route No. 002, Moscow-Vladivostok. [https://web.archive.org/web/20200406164311/https://www.poezda.net/en/train_timetable?tr_code=898975%3A%EF%BF%BD Archived] 3 December 2009.

• The Munda Biddi Trail in Western Australia, Australia, is over 1,000 km long – the world's longest off-road cycle trail
• 1.200 Mm – the length of the Paris–Brest–Paris bicycling event
• Several endurance auto races are, or were, run for 1,000 km:
• Bathurst 1000
• 1000 km Brands Hatch
• 1000 km Buenos Aires
• 1000 km Donington
• 1000 km Monza
• 1000 km Nürburgring
• 1000 km Silverstone
• 1000 km Spa
• 1000 km Suzuka
• 1000 km Zeltweg

• 1.010 Mm – distance from San Diego to El Paso as the crow flies
• 1.100 Mm – length of Italy
• 1.200 Mm – length of California
• 1.200 Mm – width of Texas
• 1.500 Mm – length of the Gobi Desert
• 1.600 Mm – length of the Namib, the oldest desert on Earth
• 2.000 Mm – distance from Beijing to Hong Kong as the crow flies
• 2.300 Mm – length of the Great Barrier Reef
• 2.800 Mm – narrowest width of Atlantic Ocean (Brazil-West Africa)
• 2.850 Mm – length of the Danube river
• 2.205 Mm – length of Sweden's total land boundaries
• 2.515 Mm – length of Norway's total land boundaries
• 3.690 Mm – length of the Volga river, longest in Europe
• 4.000 Mm – length of the Kalahari Desert
• 4.350 Mm – length of the Yellow River
• 4.600 Mm – width of the Mediterranean Sea
• 4.800 Mm – length of the Sahara
• 4.800 Mm – widest width of Atlantic Ocean (U.S.-Northern Africa)
• 5.100 Mm – distance from Dublin to New York as the crow flies
• 6.270 Mm – length of the Mississippi-Missouri River system
• 6.380 Mm – length of the Yangtze River
• 6.400 Mm – Length of the Amazon River
• 6.758 Mm – Length of the Nile system, longest on Earth
• 8.200 Mm – Approximate Distance from Dublin to San Francisco

• 1.000 Mm – estimated shortest axis of triaxial dwarf planet {{dp|Haumea}}
• 1.186 Mm – diametre of Charon, the largest moon of Pluto
• 1.280 Mm – diametre of the trans-Neptunian object 50000 Quaoar
• 1.436 Mm – diametre of Iapetus, one of Saturn's major moons
• 1.578 Mm – diametre of Titania, the largest of Uranus's moons
• 1.960 Mm – estimated longest axis of Haumea
• 2.326 Mm – diametre of the dwarf planet Eris, the largest trans-Neptunian object found to date
• 2.376 Mm – diametre of Pluto
• 2.707 Mm – diametre of Triton, largest moon of Neptune
• 3.122 Mm – diametre of Europa, the smallest Galilean satellite of Jupiter
• 3.476 Mm – diametre of Earth's Moon
• 3.643 Mm – diametre of Io, a moon of Jupiter
• 4.821 Mm – diametre of Callisto, a moon of Jupiter
• 4.879 Mm – diametre of Mercury
• 5.150 Mm – diametre of Titan, the largest moon of Saturn
• 5.262 Mm – diametre of Jupiter's moon Ganymede, the largest moon in the Solar System
• 6.371 Mm – radius of Earth
• 6.792 Mm – diametre of Mars

File:1e7m comparison Uranus Neptune Sirius B Earth Venus.png (left), Neptune (right); middle row: Earth (left), Sirius B (center), and Venus (right), to scale.]]

{{More citations needed section|date=April 2007}}

To help compare different orders of magnitude, this section lists lengths starting at 10⁷ metres (10 megametres or 10,000 kilometres).

10 megametres (10 Mm) is

• 6,215 miles
• side of a square of area 100,000,000 square kilometres (km²)
• radius of a circle of area 314,159,265 km²

• 11.085 Mm – length of the Kyiv-Vladivostok railway, a longer variant of the Trans-Siberian railway[http://www.poezda.net/en/train_timetable?tr_code=907081%3A%D4 CIS railway timetable], route No. 350, Kyiv-Vladivostok. [https://web.archive.org/web/20200406164332/https://www.poezda.net/en/train_timetable?tr_code=907081%3A%EF%BF%BD Archived] 3 December 2009.
• 13.300 Mm – length of roads rehabilitated and widened under the National Highway Development Project (launched in 1998) in India
• 39.000 Mm – length of the SEA-ME-WE 3 optical submarine telecommunications cable, joining 39 points between Norden, Germany, and Okinawa, Japan
• 67.000 Mm – total length of National Highways in India
• 80.000 Mm – 20,000 (metric, French) leagues (see Jules Verne, Twenty Thousand Leagues Under the Seas)

• 10 Mm – approximate altitude of the outer boundary of the exosphere
• 10.001 Mm – length of the meridian arc from the North Pole to the Equator (the original definition of the metre was based on this length)
• 40.000 Mm – length of the Ring of Fire
• 60.000 Mm – total length of the mid-ocean ridges

• 12.000 Mm – diametre of Sirius B, a white dwarf{{cite news|first=Christine|last=McGourty

|title=Hubble finds mass of white dwarf

|work=BBC News|date=14 December 2005

|url=http://news.bbc.co.uk/2/hi/science/nature/4528586.stm

|access-date=13 October 2007}}

• 12.104 Mm – diametre of Venus
• 12.742 Mm – diametre of Earth
• 12.900 Mm – minimum distance of the meteoroid {{mpl|2004 FU|162}} from the centre of Earth on 31 March 2004, closest on record
• 14.000 Mm – smallest diametre of Jupiter's Great Red Spot
• 19.000 Mm – separation between Pluto and Charon
• 30.8568 Mm – 1 nanoparsec
• 34.770 Mm – minimum distance of the asteroid 99942 Apophis on 13 April 2029 from the centre of Earth
• 35.786 Mm – altitude of geostationary orbit
• 40.005 Mm – polar circumference of the Earth
• 40.077 Mm – equatorial circumference of the Earth
• 49.528 Mm – diametre of Neptune
• 51.118 Mm – diametre of Uranus

File:1e8m comparison Saturn Jupiter OGLE-TR-122b with Uranus Neptune Sirius B Earth Venus no transparency.png-Moon orbit, Saturn, OGLE-TR-122b, Jupiter, and other objects, to scale. Click on image for detailed view and links to other length scales.]]

File:Scale model of Solar System 10 billion to 1.svg

To help compare different orders of magnitude, this section lists lengths starting at 10⁸ metres (100 megametres or 100,000 kilometres or 62,150 miles).

• 102 Mm – diametre of HD 149026 b, an unusually dense Jovian planet
• 115 Mm – width of Saturn's Rings
• 120 Mm – diametre of EBLM J0555-57Ab, the smallest-known star
• 120 Mm – diametre of Saturn
• 142 Mm – diametre of Jupiter, the largest planet in the Solar System
• 170 Mm – diametre of TRAPPIST-1, a star discovered to have seven planets around it
• 174 Mm – diametre of OGLE-TR-122b, one of the smallest known stars
• 180 Mm – average distance covered during life
• 215 Mm – diametre of Proxima Centauri, the nearest star to the Solar System
• 257 Mm – diametre of TrES-4, one of the largest exoplanets
• 260 Mm – diametre of the Barnard's Star
• 272 Mm – diametre of WASP-12b
• 299.792 Mm – one light-second; the distance light travels in vacuum in one second (see speed of light)
• 314 Mm – diametre of CT Cha b
• 384.4 Mm (238,855 mi) – average Earth–Moon distance{{cite web|author=NASA Staff|title=Solar System Exploration – Earth's Moon: Facts & Figures|url=http://solarsystem.nasa.gov/planets/profile.cfm?Display=Facts&Object=Moon|date=10 May 2011|publisher=NASA|access-date=6 November 2011|archive-url=https://web.archive.org/web/20111107170202/http://solarsystem.nasa.gov/planets/profile.cfm?Display=Facts&Object=Moon|archive-date=7 November 2011|url-status=dead}}
• 671 Mm – separation between Jupiter and Europa
• 696 Mm – radius of Sun
• 989 Mm – diametre of Epsilon Indi, one of the nearest stars to Earth

File:Gigameter group.png

File:1e9m comparison Gamma Orionis, Algol B, the Sun, and smaller - antialiased no transparency.png, Algol B, the Sun (centre), and other objects to scale.]]

The {{vanchor|gigametre}} (SI symbol: {{vanchor|Gm}}) is a unit of length in the metric system equal to {{gaps|1|000|000|000}} metres (10⁹ m).

To help compare different distances this section lists lengths starting at 10⁹ metres (1 gigametre (Gm) or 1 billion metres).

• 1.2 Gm – separation between Saturn and Titan
• 1.39 Gm – diametre of Sun{{cite web|url=https://nssdc.gsfc.nasa.gov/planetary/factsheet/sunfact.html|title=Sun Fact Sheet|website=nssdc.gsfc.nasa.gov}}[http://nssdc.gsfc.nasa.gov/planetary/factsheet/sunfact.html Sun Fact Sheet]
• 1.5 Gm – orbit from Earth of the James Webb Space Telescope
• 1.71 Gm – diametre of Alpha Centauri A, one of the closest stars.{{cite journal | arxiv=2104.10086 | doi=10.3847/1538-3881/abfaff | doi-access=free | title=Precision Millimetre Astrometry of the α Centauri AB System | date=2021 | last1=Akeson | first1=Rachel | last2=Beichman | first2=Charles | last3=Kervella | first3=Pierre | last4=Fomalont | first4=Edward | last5=Benedict | first5=G. Fritz | journal=The Astronomical Journal | volume=162 | issue=1 | page=14 | bibcode=2021AJ....162...14A }}
• 2.19 Gm – closest approach of Comet Lexell to Earth, happened on 1 July 1770; closest comet approach on record
• 2.38 Gm – diametre of Sirius A, brightest naked eye star.{{cite journal | arxiv=astro-ph/0507523 | doi=10.1086/462419 | title=The Age and Progenitor Mass of Sirius B | date=2005 | last1=Liebert | first1=James | last2=Young | first2=Patrick A. | last3=Arnett | first3=David | last4=Holberg | first4=J. B. | last5=Williams | first5=Kurtis A. | journal=The Astrophysical Journal | volume=630 | issue=1 | pages=L69–L72 | bibcode=2005ApJ...630L..69L | s2cid=8792889 }}
• 3 Gm – total length of "wiring" in the human brainNeuroscience: The Science of the Brain{{cite web|url=http://www.braincampaign.org/Pub/Pub_Main_Display.asp?LC_Docs_ID%3D2769|title=IBRO Brain Campaign|access-date=8 June 2011|url-status=dead|archive-url=https://web.archive.org/web/20110202081347/http://www.braincampaign.org/Pub/Pub_Main_Display.asp?LC_Docs_ID=2769|archive-date=2 February 2011}} p.44
• 3.5 Gm – diametre of Vega{{cite journal | doi=10.1088/0004-637X/708/1/71 | title=A New View of Vega's Composition, Mass, and Age | date=2010 | last1=Yoon | first1=Jinmi | last2=Peterson | first2=Deane M. | last3=Kurucz | first3=Robert L. | last4=Zagarello | first4=Robert J. | journal=The Astrophysical Journal | volume=708 | issue=1 | pages=71–79 | bibcode=2010ApJ...708...71Y | s2cid=120986935 | doi-access=free }}
• 4.2 Gm – diametre of Algol B
• 4.3 Gm – circumference of Sun
• 5.0 Gm – closest approach of Comet Halley to Earth, happened on 10 April 837
• 5.0 Gm – (proposed) Size of the arms of the giant triangle shaped Michelson interferometre of the Laser Interferometre Space Antenna (LISA) planned to start observations sometime in the 2030s.
• 7.9 Gm – diametre of Gamma Orionis, a blue dwarf or blue giant
• 9.0 Gm – estimated diametre of the event horizon of Sagittarius A*, the supermassive black hole in the center of the Milky Way galaxy

File:1e10m comparison Rigel, Aldebaran, and smaller - antialiased no transparency.png

To help compare different distances this section lists lengths starting at 10¹⁰ metres (10 gigametres (Gm) or 10 million kilometres, or 0.07 astronomical units).

• 10.4 Gm – diametre of Spica, an oval-shaped blue giant star and a nearby supernova candidate.{{citation |last1=Tkachenko |first1=A. |title=Stellar modelling of Spica, a high-mass spectroscopic binary with a β Cep variable primary component |date=May 2016 |journal=Monthly Notices of the Royal Astronomical Society |volume=458 |issue=2 |pages=1964–1976 |arxiv=1601.08069 |bibcode=2016MNRAS.458.1964T |doi=10.1093/mnras/stw255 |s2cid=26945389 |display-authors=1 |last2=Matthews |first2=J. M. |last3=Aerts |first3=C. |last4=Pavlovski |first4=K. |last5=Pápics |first5=P. I. |last6=Zwintz |first6=K. |last7=Cameron |first7=C. |last8=Walker |first8=G. A. H. |last9=Kuschnig |first9=R. |doi-access=free |last10=Degroote |first10=P. |last11=Debosscher |first11=J. |last12=Moravveji |first12=E. |last13=Kolbas |first13=V. |last14=Guenther |first14=D. B. |last15=Moffat |first15=A. F. J. |last16=Rowe |first16=J. F. |last17=Rucinski |first17=S. M. |last18=Sasselov |first18=D. |last19=Weiss |first19=W. W.}}
• 12.6 Gm – diametre of Pollux, the closest red giant star to the Sun.{{cite journal | arxiv=1712.08109 | doi=10.3847/1538-3881/aa9d8b | doi-access=free | title=Fundamental Parametres of 87 Stars from the Navy Precision Optical Interferometre | date=2017 | last1=Baines | first1=Ellyn K. | last2=Armstrong | first2=J. Thomas | last3=Schmitt | first3=Henrique R. | last4=Zavala | first4=R. T. | last5=Benson | first5=James A. | last6=Hutter | first6=Donald J. | last7=Tycner | first7=Christopher | last8=Belle | first8=Gerard T. van | journal=The Astronomical Journal | volume=155 | issue=1 | page=30 | bibcode=2018AJ....155...30B }} It is a red clump star fusing helium into carbon at its core.{{Cite journal |last1=Howes |first1=Louise M. |last2=Lindegren |first2=Lennart |last3=Feltzing |first3=Sofia |last4=Church |first4=Ross P. |last5=Bensby |first5=Thomas |date=2019-02-01 |title=Estimating stellar ages and metallicities from parallaxes and broadband photometry: successes and shortcomings |url=https://www.aanda.org/articles/aa/abs/2019/02/aa33280-18/aa33280-18.html |journal=Astronomy & Astrophysics |language=en |volume=622 |pages=A27 |doi=10.1051/0004-6361/201833280 |arxiv=1804.08321 |bibcode=2019A&A...622A..27H |issn=0004-6361}}
• 15 Gm – closest distance of Comet Hyakutake from Earth
• 18 Gm – one light-minute (see yellow sphere in right-hand diagram)
• 24 Gm – radius of a heliostationary orbit
• 30.8568 Gm – 1 microparsec
• 35 Gm – approximate diametre of Arcturus, a close red giant star.{{cite journal | arxiv=1109.4425 | doi=10.1088/0004-637X/743/2/135 | title=Fundamental Parametres and Chemical Composition of Arcturus | date=2011 | last1=Ramírez | first1=I. | last2=Allende Prieto | first2=C. | journal=The Astrophysical Journal | volume=743 | issue=2 | page=135 | bibcode=2011ApJ...743..135R | s2cid=119186472 }} It is on the red giant branch, fusing hydrogen into helium in a shell surrounding an inert helium core.
• 46 Gm – perihelion distance of Mercury (yellow ellipse on the right)
• 55 Gm – 60,000-year perigee of Mars (last achieved on 27 August 2003)
• 58 Gm – average passing distance between Earth and Mars at the moment they overtake each other in their orbits
• 61 Gm – diametre of Aldebaran, a red giant branch star (large star on right){{Cite journal |last1=Richichi |first1=A. |last2=Roccatagliata |first2=V. |last3=Shultz |first3=Matt |last4=Williamson |first4=Michael H. |last5=Moya |first5=Andres |year=2005 |title=Aldebaran's angular diametre: How well do we know it? |journal=Astronomy & Astrophysics |volume=433 |issue=1 |pages=305–312 |arxiv=astro-ph/0502181 |bibcode=2005A&A...433..305R |doi=10.1051/0004-6361:20041765 |s2cid=119414301}} They derived an angular diametre of 20.58±0.03 milliarcsec, which given a distance of 65 light-years yields a diametre of 61 million km.
• 70 Gm – aphelion distance of Mercury
• 76 Gm – Neso's apocentric distance; greatest distance of a natural satellite from its parent planet (Neptune)

File:1e11m comparison R Doradus and Betelgeuse, and smaller - antialiased no transparency.png

To help compare distances at different orders of magnitude this section lists lengths starting at 10¹¹ metres (100 gigametre or 100 million kilometres or 0.7 astronomical units).

• 103 Gm (0.69 au) – diametre of Rigel
• 109 Gm (0.7 au) – distance between Venus and the Sun
• 149.6 Gm (93.0 million mi; 1.0 au) – average distance between the Earth and the Sun – the original definition of the astronomical unit
• 163 Gm (1.09 au) – diametre of Deneb, a blue supergiant
• 228 Gm (1.5 au) – distance between Mars and the Sun
• 255 Gm (1.7 au) – diametre of Enif, a small red supergiant star in the constellation Pegasus
• 511 Gm (3.4 au) – average diametre of Mira, a pulsating red giant and the progenitor of the Mira variables. It is an asymptotic giant branch star.{{Cite journal |last1=Woodruff |first1=H. C. |last2=Eberhardt |first2=M. |last3=Driebe |first3=T. |last4=Hofmann |first4=K.-H. |last5=Ohnaka |first5=K. |last6=Richichi |first6=A. |last7=Schertl |first7=D. |last8=Schoeller |first8=M. |last9=Scholz |first9=M. |last10=Weigelt |first10=G. |last11=Wittkowski |first11=M. |last12=Wood |first12=P. R. |date=July 2004 |title=Interferometric observations of the Mira star o Ceti with the VLTI/VINCI instrument in the near-infrared |journal=Astronomy & Astrophysics |volume=421 |issue=2 |pages=703–714 |doi=10.1051/0004-6361:20035826 |arxiv=astro-ph/0404248 |bibcode=2004A&A...421..703W |issn=0004-6361}}
• 570 Gm (3.8 au) – length of the tail of Comet Hyakutake measured by Ulysses; the actual value could be much higher
• 590 Gm (3.9 au) – diametre of the Pistol Star, a blue hypergiant star{{cite journal | arxiv=1403.5298 | doi=10.1088/0004-637X/785/2/120 | title=Nature Versus Nurture: Luminous Blue Variable Nebulae in and Near Massive Stellar Clusters at the Galactic Center | date=2014 | last1=Lau | first1=R. M. | last2=Herter | first2=T. L. | last3=Morris | first3=M. R. | last4=Adams | first4=J. D. | journal=The Astrophysical Journal | volume=785 | issue=2 | page=120 | bibcode=2014ApJ...785..120L | s2cid=118447462 }}
• 591 Gm (4.0 au) – minimum distance between the Earth and Jupiter
• 780 Gm (5.2 au) – average distance between Jupiter and the Sun
• 785 Gm (5.25 au) – diametre of Rho Cassiopeiae, a rare yellow hypergiant star{{Cite arXiv |last1=Anugu |first1=Narsireddy |last2=Baron |first2=Fabien |last3=Monnier |first3=John D. |last4=Gies |first4=Douglas R. |last5=Roettenbacher |first5=Rachael M. |last6=Schaefer |first6=Gail H. |last7=Montargès |first7=Miguel |last8=Kraus |first8=Stefan |last9=Bouquin |first9=Jean-Baptiste Le |date=2024-08-05 |title=CHARA Near-Infrared Imaging of the Yellow Hypergiant Star ρ Cassiopeiae: Convection Cells and Circumstellar Envelope |class=astro-ph.SR |eprint=2408.02756v2 |language=en}}
• 947 Gm (6.4 au) – diametre of Antares A
• 965 Gm (6.4 au) – maximum distance between the Earth and Jupiter

File:Terameter group.png

File:1e12m comparison Kuiper belt and smaller.png

The {{vanchor|terametre}} (SI symbol: {{vanchor|Tm}}) is a unit of length in the metric system equal to {{gaps|1|000|000|000|000}} metres (10¹² m).

To help compare different distances, this section lists lengths starting at 10¹² m (1 Tm or 1 billion km or 6.7 astronomical units).

• ≈1 Tm – 6.7 au – diametre of the red supergiant Betelgeuse based on multiple angular diametre estimates{{cite journal | arxiv=2006.09837 | doi=10.3847/1538-4357/abb8db | doi-access=free | title=Standing on the Shoulders of Giants: New Mass and Distance Estimates for Betelgeuse through Combined Evolutionary, Asteroseismic, and Hydrodynamic Simulations with MESA | date=2020 | last1=Joyce | first1=Meridith | last2=Leung | first2=Shing-Chi | last3=Molnár | first3=László | last4=Ireland | first4=Michael | last5=Kobayashi | first5=Chiaki | last6=Nomoto | first6=Ken'Ichi | journal=The Astrophysical Journal | volume=902 | issue=1 | page=63 | bibcode=2020ApJ...902...63J }}
• 1.032 Tm – 6.9 au – diametre of the blue hypergiant Eta Carinae (at optical depth 2/3){{Cite journal |last1=Gull |first1=Theodore R. |last2=Hillier |first2=D. John |last3=Hartman |first3=Henrik |last4=Corcoran |first4=Michael F. |last5=Damineli |first5=Augusto |last6=Espinoza-Galeas |first6=David |last7=Hamaguchi |first7=Kenji |last8=Navarete |first8=Felipe |last9=Nielsen |first9=Krister |last10=Madura |first10=Thomas |last11=Moffat |first11=Anthony F. J. |last12=Morris |first12=Patrick |last13=Richardson |first13=Noel D. |last14=Russell |first14=Christopher M. P. |last15=Stevens |first15=Ian R. |date=July 2022 |title=Eta Carinae: An Evolving View of the Central Binary, Its Interacting Winds and Its Foreground Ejecta |journal=The Astrophysical Journal |language=en |volume=933 |issue=2 |pages=175 |doi=10.3847/1538-4357/ac74c2 |doi-access=free |arxiv=2205.15116 |bibcode=2022ApJ...933..175G |issn=0004-637X}}
• 1.079 Tm – 7.2 au – one light-hour
• 1.114 Tm – 7.5 au – diametre of WOH G64, a star in the Large Magellanic Cloud, which recently transformed from a red hypergiant to a yellow hypergiant{{cite arXiv |last1=Munoz-Sanchez |first1=G. |title=The dramatic transition of the extreme Red Supergiant WOH G64 to a Yellow Hypergiant |date=2024-12-02 |eprint=2411.19329 |class=astro-ph.SR |last2=Kalitsounaki |first2=M. |last3=Wit |first3=S. de |last4=Antoniadis |first4=K. |last5=Bonanos |first5=A. Z. |last6=Zapartas |first6=E. |last7=Boutsia |first7=K. |last8=Christodoulou |first8=E. |last9=Maravelias |first9=G.}}
• 1.4 Tm – 9.5 au – average distance between Saturn and the Sun
• 1.47 Tm – 9.9 au – diametre of HR 5171 A, a yellow hypergiant star.{{cite journal |last1=van Genderen |first1=A. M. |last2=Lobel |first2=A. |last3=Nieuwenhuijzen |first3=H. |last4=Henry |first4=G. W. |last5=De Jager |first5=C. |last6=Blown |first6=E. |last7=Di Scala |first7=G. |last8=Van Ballegoij |first8=E. J. |year=2019 |title=Pulsations, eruptions, and evolution of four yellow hypergiants |journal=Astronomy and Astrophysics |volume=631 |pages=A48 |arxiv=1910.02460 |bibcode=2019A&A...631A..48V |doi=10.1051/0004-6361/201834358 |s2cid=203836020}}
• 1.5 Tm – 10 au – estimated diametre of VV Cephei A, a red hypergiant with a blue dwarf companion.{{cite journal|last1=Bauer|first1=W. H.|last2=Gull|first2=T. R.|last3=Bennett|first3=P. D.|doi=10.1088/0004-6256/136/3/1312|title=Spatial Extension in the Ultraviolet Spectrum of Vv Cephei|journal=The Astronomical Journal|volume=136|issue=3|pages=1312|year=2008|bibcode=2008AJ....136.1312H|s2cid=119404901 |doi-access=free}}
• 1.75 Tm – 11.7 au – estimated diametre of Mu Cephei, a red supergiant (possibly hypergiant) among the largest-known stars.Table 4 in {{cite journal |author1=Emily M. Levesque |author1-link=Emily Levesque |author2=Philip Massey |author3=K. A. G. Olsen |author4=Bertrand Plez |author5=Eric Josselin |author6=Andre Maeder |author7=Georges Meynet |name-list-style=amp |year=2005 |title=The Effective Temperature Scale of Galactic Red Supergiants: Cool, but Not As Cool As We Thought |journal=The Astrophysical Journal |volume=628 |issue=2 |pages=973–985 |arxiv=astro-ph/0504337 |bibcode=2005ApJ...628..973L |doi=10.1086/430901 |s2cid=15109583}}
• 2 Tm – 13.2 au – estimated diametre of VY Canis Majoris, a red hypergiant that is among the largest-known stars{{cite journal | arxiv=1512.01529 | doi=10.3847/0004-6256/151/3/51 | doi-access=free | title=SEARCHING FOR COOL DUST IN THE MID-TO-FAR INFRARED: THE MASS-LOSS HISTORIES OF THE HYPERGIANTS μ Cep, VY CMa, IRC+10420, AND ρ Cas | date=2016 | last1=Shenoy | first1=Dinesh | last2=Humphreys | first2=Roberta M. | last3=Jones | first3=Terry J. | last4=Marengo | first4=Massimo | last5=Gehrz | first5=Robert D. | last6=Helton | first6=L. Andrew | last7=Hoffmann | first7=William F. | last8=Skemer | first8=Andrew J. | last9=Hinz | first9=Philip M. | journal=The Astronomical Journal | volume=151 | issue=3 | page=51 | bibcode=2016AJ....151...51S }}{{cite journal|doi=10.1051/0004-6361/201219126|last1=Wittkowski|first1=M.|last2=Hauschildt|first2=P.H.|last3=Arroyo-Torres|first3=B.|last4=Marcaide|first4=J.M.|title=Fundamental properties and atmospheric structure of the red supergiant VY CMa based on VLTI/AMBER spectro-interferometry|journal=Astronomy & Astrophysics|volume=540|pages=L12|date=5 April 2012|bibcode=2012A&A...540L..12W|arxiv=1203.5194|s2cid=54044968}}
• 2.142 Tm – 14.3 au – estimated diametre of WOH G64, prior to its transformation into a yellow hypergiant.
• 2.9 Tm – 19.4 au – average distance between Uranus and the Sun
• 4.4 Tm – 29.4 au – perihelion distance of Pluto
• 4.5 Tm – 30.1 au – average distance between Neptune and the Sun
• 4.5 Tm – 30.1 au – inner radius of the Kuiper belt
• 5.7 Tm – 38.1 au – perihelion distance of Eris
• 6.0 Tm – 40.5 au – distance from Earth at which the Pale Blue Dot photograph was taken.
• 7.3 Tm – 48.8 au – aphelion distance of Pluto
• 7.5 Tm – 50.1 au – outer boundary of the Kuiper Belt

File:1e13m comparison Hale Bopp and smaller - HQ no transparency.png's orbit (lower, faint orange); one light-day (yellow spherical shell with yellow Vernal point arrow as radius); the heliosphere's termination shock (blue shell); and other arrows show positions of Voyager 1 (red) and Pioneer 10 (green). Click on image for larger view and links to other scales.]]

To help compare different distances this section lists lengths starting at 10¹³ m (10 Tm or 10 billion km or 67 astronomical units).

• 10 Tm – 67 AU – diametre of a hypothetical quasi-star
• 11.1 Tm – 74.2 AU – distance that Voyager 1 began detecting returning particles from termination shock
• 11.4 Tm – 76.2 AU – perihelion distance of 90377 Sedna
• 12.1 Tm – 70 to 90 AU – distance to termination shock (Voyager 1 crossed at 94 AU)
• 12.9 Tm – 86.3 AU – distance to 90377 Sedna in March 2014
• 13.2 Tm – 88.6 AU – distance to Pioneer 11 in March 2014
• 14.1 Tm – 94.3 AU – estimated radius of the Solar System
• 14.4 Tm – 96.4 AU – distance to Eris in March 2014 (now near its aphelion)
• 15.1 Tm – 101 AU – distance to heliosheath
• 16.5 Tm – 111 AU – distance to Pioneer 10 as of March 2014
• 16.6 Tm – 111.2 AU – distance to Voyager 2 as of May 2016
• 18 Tm – 123.5 AU – distance between the Sun to the farthest dwarf planet in the Solar System, the Farout 2018 VG18
• 20.0 Tm – 135 AU – distance to Voyager 1 as of May 2016
• 20.6 Tm – 138 AU – distance to Voyager 1 as of late February 2017
• 20.8 Tm – 139 AU – distance to Voyager 2 as of July 2025
• 21.1 Tm – 141 AU – distance to Voyager 1 as of November 2017
• 24.9 Tm – 166 AU – distance to Voyager 1 as of July 2025
• 25.9 Tm – 173 AU – one light-day
• 30.8568 Tm – 206.3 AU – 1 milliparsec
• 55.7 Tm – 371 AU – aphelion distance of the comet Hale-Bopp

File:1e14m comparison light day week and month.png

{{Incomplete list|date=November 2012}}

To help compare different distances this section lists lengths starting at 10¹⁴ m (100 Tm or 100 billion km or 670 astronomical units).

• 140 Tm – 937 AU – aphelion distance of 90377 Sedna
• 172 Tm – 1150 AU – Schwarzschild diametre of H1821+643, one of the most massive black holes known
• 181 Tm – 1210 AU – one light-week
• 308.568 Tm – 2063 AU – 1 centiparsec
• 757 Tm – 5059 AU – radius of the Stingray Nebula{{cite journal|last1=Parthasarathy|first1=M.|title=Birth and early evolution of planetary nebulae|journal=Bulletin of the Astronomical Society of India|year=2000|volume=28|pages=217–224|bibcode=2000BASI...28..217P}}
• 777 Tm – 5180 AU – one light-month

File:1e15m comparison cat's eye nebula barnard 68 one light year.png from Sun; Cat's Eye Nebula on left and Barnard 68 in middle are depicted in front of Comet 1910 A1's orbit. Click image for larger view, details and links to other scales.]]

The {{vanchor|petametre}} (SI symbol: {{vanchor|Pm}}) is a unit of length in the metric system equal to 10¹⁵ metres.

To help compare different distances this section lists lengths starting at 10¹⁵ m (1 Pm or 1 trillion km or 6685 astronomical units (AU) or 0.11 light-years).

• 1.0 Pm = 0.105702341 light-years
• 1.9 Pm ± 0.5 Pm = 12,000 AU = 0.2 light-year radius of Cat's Eye Nebula's inner coreradius = distance times sin(angular diametre/2) = 0.2 light-year. Distance = 3.3 ± 0.9 kly; angular diametre = 20 arcseconds {{Harv|Reed|Balick|Hajian|Klayton|1999}}{{Cite journal

| last1 = Reed

| first1 = Darren S.

| last2 = Balick

| first2 = Bruce

| last3 = Hajian

| first3 = Arsen R.

| last4 = Klayton

| first4 = Tracy L.

| last5 = Giovanardi

| first5 = Stefano

| last6 = Casertano

| first6 = Stefano

| last7 = Panagia

| first7 = Nino

| last8 = Terzian

| first8 = Yervant

| title = Hubble Space Telescope Measurements of the Expansion of NGC 6543: Parallax Distance and Nebular Evolution

| journal = Astronomical Journal

| year = 1999

| volume = 118

| issue = 5

| pages = 2430–2441

| bibcode = 1999AJ....118.2430R

| doi = 10.1086/301091

|arxiv = astro-ph/9907313 | s2cid = 14746840

}}

• 3.08568 Pm = 20,626 AU = 1 deciparsec
• 4.7 Pm = 30,000 AU = half-light-year diametre of Bok globule Barnard 68{{cite web|first=Michael|last=Szpir|title=Bart Bok's Black Blobs|url=http://www.americanscientist.org/template/AssetDetail/assetid/14678|date=May–June 2001|archive-url=https://web.archive.org/web/20030629033609/http://www.americanscientist.org/template/AssetDetail/assetid/14678|archive-date=29 June 2003|publisher=American Scientist|quote=Bok globules such as Barnard 68 are only about half a light-year across and weigh in at about two solar masses|access-date=19 November 2008}}
• 7.5 Pm – 50,000 AU – possible outer boundary of Oort cloud (other estimates are 75,000 to 125,000 or even 189,000 AU (1.18, 2, and 3 light-years, respectively))
• 9.5 Pm – 63,241.1 AU – one light-year, the distance light travels in one year
• 9.9 Pm – 66,000 AU – aphelion distance of the C/1999 F1 (Catalina)

File:1e16m comparison ten light years bubble nebula.png) radius circle with yellow Vernal Point arrow; Bubble Nebula (NGC 7635), left; Dumbbell Nebula (NGC 6853), right; one light-year shell lower right with the smaller Cat's Eye Nebula (NGC_6543) and Barnard 68 adjacent.]]

File:1e16m comparison 10 light years sirius.png) yellow shell; Sirius below right; BL Ceti below left; Proxima and Alpha Centauri upper right; light-year shell with Comet 1910 A1's orbit inside top right]]

To help compare different distances this section lists lengths starting at 10¹⁶ m (10 Pm or 66,800 AU, 1.06 light-years).

• 15 Pm – 1.59 light-years – possible outer radius of Oort cloud
• 20 Pm – 2.11 light-years – maximum extent of influence of the Sun's gravitational field{{Citation needed|reason=Where is this value from? The Sun's Hill sphere with respect to the galaxy is about 1.1 parsecs, per Chebotarev (1964)|date=January 2018}}
• 30.9 Pm – 3.26 light-years – 1 parsec
• 39.9 Pm – 4.22 light-years – distance to Proxima Centauri (nearest star to Sun)
• 81.3 Pm – 8.59 light-years – distance to Sirius
• 94.6 Pm – 1 light-decade

File:1e17m comparison 100 light years nebula clusters.png

To help compare different distances this section lists lengths between 10¹⁷ m (100 Pm or 11 light-years) and 10¹⁸ m (106 light-years).

• 110 Pm – 12 light-years – Distance to Tau Ceti
• 230 Pm – 24 light-years – Diametre of the Orion Nebula{{cite journal|last=Sandstrom|first=Karin M|author2=Peek, J. E. G.|author3=Bower, Geoffrey C.|author4=Bolatto, Alberto D.|author5=Plambeck, Richard L.|title=A Parallactic Distance of {{val|389|+24|-21}} parsecs to the Orion Nebula Cluster from Very Long Baseline Array Observations|journal=The Astrophysical Journal|year=1999|volume=667|issue=2|pages=1161–1169|doi=10.1086/520922|bibcode=2007ApJ...667.1161S|arxiv=0706.2361|s2cid=18192326}}diametre=sin(65 arcminutes)*1270 light-years=24; where "65.00 × 60.0 (arcmin)" sourced from [https://web.archive.org/web/20120318092511/http://spider.seds.org/ngc/revngcic.cgi?NGC1976 Revised NGC Data for NGC 1976]{{cbignore}}
• 240 Pm – 25 light-years – Distance to Vega
• 260 Pm – 27 light-years – Distance to Chara, a star approximately as bright as the Sun. Its faintness gives an idea how the Sun would appear when viewed from this distance.
• 308.568 Tm – 32.6 light-years – 1 dekaparsec
• 350 Pm – 37 light-years – distance to Arcturus
• 373.1 Pm – 39.44 light-years – distance to TRAPPIST-1, a star recently discovered to have 7 planets around it
• 400 Pm – 42 light-years – distance to Capella
• 620 Pm – 65 light-years – distance to Aldebaran
• 750 Pm – 79.36 light-years – distance to Regulus
• 900 Pm – 92.73 light-years – distance to Algol
• 946 Pm – 1 light-century

File:1e18m comparison 1000 light years nebula clusters.png

The {{vanchor|exametre}} (SI symbol: {{vanchor|Em}}) is a unit of length in the metric system equal to 10¹⁸ metres. To help compare different distances this section lists lengths between 10¹⁸ m (1 Em or 105.7 light-years) and 10¹⁹ m (10 Em or 1,057 light-years).

• 1.2 Em – 129 light-years – diametre of Messier 13 (a typical globular cluster)
• 1.6 Em – 172 ± 12.5 light-years – diametre of Omega Centauri (one of the largest-known globular clusters, perhaps containing over a million stars)distance × sin( diametre_angle ), using distance of 5kpc (15.8 ± 1.1 kly) and angle 36.3', = 172 ± 12.5 ly.{{cite journal|last1=van de Ven|first1=G.|author2=van den Bosch, R. C. E.|author3=Verolme, E. K.|author4=de Zeeuw, P. T.|title=The dynamical distance and intrinsic structure of the globular cluster ω Centauri|journal=Astronomy and Astrophysics|year=2006|volume=445|issue=2|pages=513–543|bibcode=2006A&A...445..513V|doi=10.1051/0004-6361:20053061|quote=best-fit dynamical distance D=4.8±0.3 kpc ... consistent with the canonical value 5.0±0.2 kpc obtained by photometric methods|arxiv=astro-ph/0509228|s2cid=15538249}}
• 3.08568 Em – 326.1 light-years – 1 hectoparsec
• 3.1 Em – 310 light-years – distance to Canopus according to Hipparcos{{cite journal|title=Validation of the new Hipparcos reduction|last1=van Leeuwen|first1=F.|journal=Astronomy and Astrophysics|volume=474|issue=2|pages=653–664|year=2007|arxiv=0708.1752|bibcode=2007A&A...474..653V|doi=10.1051/0004-6361:20078357|s2cid=18759600}} [http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-ref=VIZ53e6b48255b3&-out.add=.&-source=I/311/hip2&recno=30362 Vizier catalog entry]
• 3.9 Em – 410 light-years – distance to Betelgeuse according to Hipparcos{{Cite journal |last1=Neuhäuser |first1=R |last2=Torres |first2=G |last3=Mugrauer |first3=M |last4=Neuhäuser |first4=D L |last5=Chapman |first5=J |last6=Luge |first6=D |last7=Cosci |first7=M |date=2022-07-29 |title=Colour evolution of Betelgeuse and Antares over two millennia, derived from historical records, as a new constraint on mass and age |journal=Monthly Notices of the Royal Astronomical Society |volume=516 |issue=1 |pages=693–719 |doi=10.1093/mnras/stac1969 |doi-access=free |issn=0035-8711|arxiv=2207.04702 }}
• 6.2 Em – 650 light-years – distance to the Helix Nebula, located in the constellation Aquarius{{cite journal|bibcode=2007AJ....133..631H|title=Trigonometric Parallaxes of Central Stars of Planetary Nebulae|year=2007|journal=The Astronomical Journal|volume=133|issue=2|pages=631–638|doi=10.1086/510348|author=Harris, Hugh C.|display-authors=4|author2=Dahn, Conard C.|author3=Canzian, Blaise|author4=Guetter, Harry H.|author5=Leggett, S. K.|author6=Levine, Stephen E.|author7=Luginbuhl, Christian B.|author8=Monet, Alice K. B.|author9=Monet, David G.|author10=Pier, Jeffrey R.|author11=Stone, Ronald C.|author12=Tilleman, Trudy|author13=Vrba, Frederick J.|author14=Walker, Richard L.|arxiv=astro-ph/0611543|s2cid=18261027}}
• 8.2 Em – 860 light-years – distance to Rigel according to Hipparcos
• 9.4 Em — 1 light-millennium – 1000 light-years

To help compare different orders of magnitude, this section lists distances starting at 10 Em (10¹⁹ m or 1,100 light-years).

• 10.6 Em – 1,120 light-years – distance to WASP-96b
• 13 Em – 1,300 light-years – distance to the Orion Nebula

{{cite journal|last1=Reid|first1=M. J.|first2=K. M.|last2=Menten|first3=X. W.|last3=Zheng|first4=A.|last4=Brunthaler|first5=L.|last5=Moscadelli|first6=Y.|last6=Xu|first7=B.|last7=Zhang|first8=M.|last8=Sato|first9=M.|last9=Honma|first10=T.|last10=Hirota|first11=K.|last11=Hachisuka|first12=Y. K.|last12=Choi|first13=G. A.|last13=Moellenbrock|first14=A.|last14=Bartkiewicz|display-authors=1|year=2009|title=Trigonometric Parallaxes of Massive Star Forming Regions: VI. Galactic Structure, Fundamental Parametres and Non-Circular Motions|journal=Astrophysical Journal|volume=700|issue=1|pages=137–148|arxiv=0902.3913|doi=10.1088/0004-637X/700/1/137|bibcode=2009ApJ...700..137R|s2cid=11347166}}

• 14 Em – 1,500 light-years – approximate thickness of the plane of the Milky Way galaxy at the Sun's location
• 14.2 Em – 1,520 light-years – diametre of the NGC 604
• 30.8568 Em – 3,261.6 light-years – 1 kiloparsec
• 31 Em – 3,200 light-years – distance to Deneb according to Hipparcos
• 46 Em – 4,900 light-years – distance to OGLE-TR-56, the first extrasolar planet discovered using the transit method
• 47 Em – 5,000 light-years – distance to the Boomerang Nebula, coldest place known (1 K)
• 53 Em – 5,600 light-years – distance to the globular cluster M4 and the extrasolar planet PSR B1620-26 b within it
• 61 Em – 6,500 light-years – distance to Perseus Spiral Arm (next spiral arm out in the Milky Way galaxy)
• 71 Em – 7,500 light-years – distance to Eta Carinae
• 94.6073 Em – 1 light-decamillennium = 10,000 light-years

To help compare different orders of magnitude, this section lists distances starting at 100 Em (10²⁰ m or 11,000 light-years).

• 150 Em – 16,000 light-years – diametre of the Small Magellanic Cloud, a dwarf galaxy orbiting the Milky Way
• 200 Em – 21,500 light-years – distance to OGLE-2005-BLG-390Lb
• 240 Em – 25,000 light-years – distance to the Canis Major Dwarf Galaxy
• 260 Em – 28,000 light-years – distance to the center of the Galaxy
• 400 Em – 48,000 light years – diametre of the Fireworks Galaxy
• 830 Em – 88,000 light-years – distance to the Sagittarius Dwarf Elliptical Galaxy
• 946 Em – 1 light-centum-millennium = 100,000 light-years

The {{vanchor|zettametre}} (SI symbol: {{vanchor|Zm}}) is a unit of length in the metric system equal to 10²¹ metres.{{cite web|title=SI Brochure: The International System of Units (SI)|url=https://www.bipm.org/en/publications/si-brochure/|website=International Committee for Weights and Measures|publisher=Organisation Intergouvernementale de la Convention du Mètre|access-date=11 October 2014}}

To help compare different orders of magnitude, this section lists distances starting at 1 Zm (10²¹ m or 110,000 light-years).

• 1.7 Zm – 179,000 light-years – distance to the Large Magellanic Cloud, largest satellite galaxy of the Milky Way
• <1.9 Zm – <200,000 light-years – revised estimated diametre of the disc of the Milky Way Galaxy. The size was previously thought to be half of this.
• 2.0 Zm – 210,000 light-years – distance to the Small Magellanic Cloud
• 2.8 Zm – 300,000 light-years – distance to the Intergalactic Wanderer, one of the most distant globular clusters of Milky Way
• 8.5 Zm – 900,000 light-years – distance to the Leo I Dwarf Galaxy, farthest-known Milky Way satellite galaxy
• 9.5 Zm – 1 light-megaannum = 1,000,000 light-years

To help compare different orders of magnitude, this section lists distances starting at 10 Zm (10²² m or 1.1 million light-years).

• 24 Zm – 2.5 million light-years – distance to the Andromeda Galaxy, the nearest major galaxy.
• 30.8568 Zm – 3.2616 million light-years – 1 megaparsec
• 40 Zm – 4.2 million light-years – distance to the IC 10, a distant member of the Local Group of galaxies
• 49.2 Zm – 5.2 million light-years – width of the Local Group of galaxies
• 95 Zm – 10 million light-years – distance to the Sculptor Galaxy in the Sculptor Group of galaxies
• 95 Zm – 10 million light-years – distance to the Maffei 1, the nearest giant elliptical galaxy in the Maffei 1 Group

To help compare different orders of magnitude, this section lists distances starting at 100 Zm (10²³ m or 11 million light-years).

• 140 Zm – 15 million light-years – distance to Centaurus A galaxy
• 250 Zm – 27 million light-years – distance to the Pinwheel Galaxy
• 280 Zm – 30 million light-years – distance to the Sombrero Galaxy
• 570 Zm – 60 million light-years – approximate distance to the Virgo Cluster, nearest galaxy cluster
• 620 Zm – 65 million light-years – approximate distance to the Fornax Cluster
• 800 Zm – 85 million light-years – approximate distance to the Eridanus Cluster

The {{vanchor|yottametre}} (SI symbol: {{vanchor|Ym}}) is a unit of length in the metric system equal to 10²⁴ metres.

To help compare different orders of magnitude, this section lists distances starting at 1 Ym (10²⁴ m or 105.702 million light-years).

• 1.2 Ym – 127 million light-years – distance to the closest observed gamma ray burst GRB 980425
• 1.3 Ym – 137 million light-years – distance to the Centaurus Cluster of galaxies, the nearest large supercluster
• 1.9 Ym – 201 million light-years – diametre of the Local Supercluster
• 2.17 Ym – 1 light-galactic-years – 230 million light-years
• 2.3 Ym – 225 to 250 million light-years – distance light travels in vacuum in one galactic year
• 2.8 Ym – 296 million light-years – distance to the Coma Cluster
• 3.15 Ym – 330 million light years – diametre of the Boötes Void
• 3.2 Ym – 338 million light-years – distance to Stephan's Quintet
• 4.7 Ym – 496 million light-years – length of the CfA2 Great Wall, one of the largest observed superstructures in the Universe
• 6.1 Ym – 645 million light-years – distance to the Shapley Supercluster
• 9.5 Ym – 996 million light-years – diametre of the Eridanus Supervoid

File:Superclusters atlasoftheuniverse.gif

To help compare different orders of magnitude, this section lists distances starting at 10 Ym (10²⁵ m or 1.1 billion light-years). At this scale, expansion of the universe becomes significant. Distance of these objects are derived from their measured redshifts, which depends on the cosmological models used.

• 13 Ym – 1.37 billion light-years – length of the South Pole Wall
• 13 Ym – 1.38 billion light-years – length of the Sloan Great Wall
• 18 Ym – redshift 0.16 – 1.9 billion light-years – distance to the quasar 3C 273 (light travel distance)
• 30.8568 Ym – 3.2616 billion light-years – 1 gigaparsec
• 31.2204106 Ym − 3.3 billion light-years − length of The Giant Arc, a large cosmic structure discovered in 2021
• 33 Ym – 3.5 billion light-years – maximum distance of the 2dF Galaxy Redshift Survey (light travel distance)
• 37.8 Ym – 4 billion light-years – length of the Huge-LQG
• 75 Ym – redshift 0.95 – 8 billion light-years – approximate distance to the supernova SN 2002dd in the Hubble Deep Field North (light travel distance)
• 85 Ym – redshift 1.6 – 9 billion light-years – approximate distance to the gamma-ray burst GRB 990123 (light travel distance)
• 94.6 Ym – 10 billion light-years – approximate distance to quasar OQ172
• 94.6 Ym – 10 billion light-years – length of the Hercules–Corona Borealis Great Wall, one of the largest and most massive-known cosmic structures known

To help compare different orders of magnitude, this section lists distances starting at 100 Ym (10²⁶ m or 11 billion light-years). At this scale, expansion of the universe becomes significant. Distance of these objects are derived from their measured redshifts, which depend on the cosmological models used.

• 124 Ym – redshift 7.54 – 13.1 billion light-years – light travel distance (LTD) to the quasar ULAS J1342+0928, the most distant-known quasar as of 2017
• 130 Ym – redshift 1,000 – 13.8 billion light-years – distance (LTD) to the source of the cosmic microwave background radiation; radius of the observable universe measured as a LTD
• 260 Ym – 27.4 billion light-years – diametre of the observable universe (double LTD)
• 440 Ym – 46 billion light-years – radius of the universe measured as a comoving distance
• 590 Ym – 62 billion light-years – cosmological event horizon: the largest comoving distance from which light will ever reach us (the observer) at any time in the future
• 886.48 Ym – 93.7 billion light-years – the diametre of the observable universe (twice the particle horizon); however, there might be unobserved distances that are even greater.

The {{vanchor|ronnametre}} (SI symbol: {{vanchor|Rm}}) is a unit of length in the metric system equal to 10²⁷ metres.

To help compare different orders of magnitude, this section lists distances starting at 1 Rm (10²⁷ m or 105.7 billion light-years). At this scale, expansion of the universe becomes significant. Distance of these objects are derived from their measured redshifts, which depend on the cosmological models used.

• >1 Rm – >105.7 billion light-years – size of universe beyond the cosmic light horizon, depending on its curvature; if the curvature is zero (i.e. the universe is spatially flat), the value can be infinite (see Shape of the universe) as previously mentioned.
• 2.764 Rm - 292.2 billion light-years – circumference of the observable universe, as it is in the shape of a sphere.
• ≈10^1010122light-years – the possible size of the universe after cosmological inflation.
• ≈∞ light-years – theoretical size of the multiverse if it exists.

• Fermi problem
• Scale (analytical tool)
• Spatial scale
• The Scale of the Universe

{{Reflist|group=note}}

{{Reflist}}

• [http://www.vendian.org/howbig/ How Big Are Things?] – displays orders of magnitude in successively larger rooms.
• [https://web.archive.org/web/20120702055359/http://microcosm.web.cern.ch/microcosm/P10/english/welcome.html Powers of Ten] – Travel across the Universe.
• [https://web.archive.org/web/20080412094332/http://www.shekpvar.net/~dna/Publications/Cosmos/cosmos.html Cosmos – Journey from microcosmos to macrocosmos] (Digital Nature Agency).
• [http://htwins.net/scale2/ Scale of the universe] – interactive guide to length magnitudes
• {{youTube|FglEbPXxka4|Video (4:29)}} – [https://venturebeat.com/2020/03/16/orders-of-magnitude-vr-reveals-humanitys-tiny-scale-in-the-universe/ Orders of Magnitude] (March 2020).

{{Metric units of length}}

{{Orders of magnitude}}

{{Units of length used in Astronomy}}

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Category:Length

Length

Category:Lists by length

Category:Units of length