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Our world is a planet where human beings have formed many societies.
Nobody knows whether there are intelligent beings on other worlds.
There are about one septillion (1024) worlds in the universe.Burci, Gian Luca; Vignes, Claude-Henri (2004). [https://books.google.com/books?id=Xou_nD9jJF0C World Health Organization]. Kluwer Law International. {{ISBN|9789041122735}}. Pages 15–20.{{Cite journal|title = Mortality in mental disorders and global disease burden implications: a systematic review and meta-analysis|url = https://www.ncbi.nlm.nih.gov/pubmed/25671328|journal = JAMA psychiatry|date = 2015-04-01|issn = 2168-6238|pmc = 4461039|pmid = 25671328|pages = 334-341|volume = 72|issue = 4|doi = 10.1001/jamapsychiatry.2014.2502|first = Elizabeth Reisinger|last = Walker|first2 = Robin E.|last2 = McGee|first3 = Benjamin G.|last3 = Druss}} {{Open access}}{{Cite journal|title = Essential surgery: key messages from Disease Control Priorities, 3rd edition|url = https://www.ncbi.nlm.nih.gov/pubmed/25662414|journal = Lancet|date = 2015-05-30|issn = 1474-547X|pmid = 25662414|pages = 2209-2219|volume = 385|issue = 9983|doi = 10.1016/S0140-6736(15)60091-5|first = Charles N.|last = Mock|first2 = Peter|last2 = Donkor|first3 = Atul|last3 = Gawande|first4 = Dean T.|last4 = Jamison|first5 = Margaret E.|last5 = Kruk|first6 = Haile T.|last6 = Debas}}