1/ Well, sure. ...and you can theoretically do it here on Earth too.https://twitter.com/qikipedia/status/851857701097398274 …
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4/ The moon is not ENTIRELY atmosphere free...just mostly. N.B. each Apollo LEM ascent stage doubled lunar atmosphere (for a few days)
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5/ You can shoot yourself in the back on Earth, but you want to aim high, so that most of ballistic trajectory is out of atmosphere.
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