1/ Well, sure. ...and you can theoretically do it here on Earth too.https://twitter.com/qikipedia/status/851857701097398274 …
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Replying to @MorlockP
2/ Lunar orbital velocity is 3758 m/hr https://www.quora.com/How-fast-must-an-object-be-moving-to-orbit-the-moon-at-elevation-of-say-1-2-miles-above-surface … = 4045 ft/s AR-15 muzzle velocity = 3,300 ft/s need something faster
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Replying to @MorlockP
3/ .220 Swift might do it. ...barely. https://en.wikipedia.org/wiki/.220_Swift
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Replying to @MorlockP
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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Replying to @MorlockP
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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6/ This is the same theory for why airplanes fly high...and why WWII V-2 missiles flew above the atmosphere!
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