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==In Law==
==In Law==
In the [[United States]], there is no legal definition for "space;" however, a crew member of a government vehicle is considered an astronaut if they have been above 50 miles in altitude above mean sea level. This definition of astronaut leads to a common acceptance of "space" in legal documents as beginning at 50 miles in altitude.
In the [[United States]], there is no legal definition for "space;" however, a crew member of a government vehicle is considered an astronaut if they have been above 50 miles in altitude above mean sea level. This definition of astronaut leads to a common acceptance of "space" in legal documents as beginning at 50 miles in altitude (~ 80.5 km).
The USA is not the only country to lack a legal definition of outer space; however, one common definition in countries which use the [[metric system]] is the Kármán line, which labels "space" as anything about 62.1 miles in altitude.<ref>http://books.google.com/books?id=NR7mFXCB-wgC&pg=PA239&lpg=PA239&dq=legal+boundary+of+space&source=web&ots=Q56qiINocX&sig=bP5Ye5YBYytJpikkfp-lUznLJUk&hl=en</ref><ref>http://www.fai.org/press_releases/2004/documents/12-04_100km_astronautics.doc</ref>
The USA is not the only country to lack a legal definition of outer space; however, one common definition in countries which use the [[metric system]] is the Kármán line, which labels "space" as anything about 100 km (~ 62.1 miles) in altitude.<ref>http://books.google.com/books?id=NR7mFXCB-wgC&pg=PA239&lpg=PA239&dq=legal+boundary+of+space&source=web&ots=Q56qiINocX&sig=bP5Ye5YBYytJpikkfp-lUznLJUk&hl=en</ref><ref>http://www.fai.org/press_releases/2004/documents/12-04_100km_astronautics.doc</ref>
Signatories of the so-called Outer Space Treaty have agreed not to test nuclear weapons in space, or claim land in outer space as sovereign territory.<ref>http://www.unoosa.org/oosa/SpaceLaw/outerspt.html</ref>
Signatories of the so-called Outer Space Treaty have agreed not to test nuclear weapons in space, or claim land in outer space as sovereign territory.<ref>http://www.unoosa.org/oosa/SpaceLaw/outerspt.html</ref>
==Greek philosophy==
==Greek philosophy==