HVC 127-41-330
{{More citations needed|date=December 2016}}
{{Infobox nebula
|image=
|caption=
|name=HVC 127-41-330
|type=High-velocity cloud
|epoch= J2000.0{{cite simbad |title= HVC 127-41-331 |access-date= 29 March 2018 }}
|dist_ly=2,300,000
|dimensions=
|names=HVC 127-41-331, HVC 128-41-329, HVC 127-42-352, HVC 127-41-330
}}
HVC 127-41-330 is a high-velocity cloud in the constellation of Pisces. The three numbers that compose its name indicate, respectively, the galactic longitude and latitude, and velocity towards Earth in km/s. It is 20,000 light years in diameter and is located 2.3 million light years (700 kiloparsecs) from Earth, between M31 and M33.{{cite web |author = Josh Simon | title = Dark Matter in Dwarf Galaxies: Observational Tests of the Cold Dark Matter Paradigm on Small Scales | version = | publisher = | date = 2005 | url = http://www.astro.caltech.edu/~jsimon/thesis/jdsthesis.pdf | access-date = |archive-date=September 13, 2006 |archive-url=https://web.archive.org/web/20060913084945/http://www.astro.caltech.edu/~jsimon/thesis/jdsthesis.pdf |url-status=dead }} This cloud of neutral hydrogen (detectable via 21 cm H-I emissions), unlike other HVCs shows a rotational component and dark matter. 80% of the mass of the cloud is dark matter. It is also the first HVC discovered not associated with the Milky Way galaxy or subgroup (subcluster).
Astronomer Josh Simon considers it a candidate for being a dark galaxy. With its rotation, it may be a very low density dwarf galaxy of unused hydrogen (no stars), a remnant of the formation of the Local Group.