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Of course you can’t use a normal side arm or any conventional fire arm to shoot the moon, not one a person could fire. But is it possible to use a canon or some massive gun that uses many times more gun powder and bullets? Like a weapon the size of a city or something lol idk. I remember reading about a story where a manhole cover was sent into space, not sure how true it is but it got me thinking if enough power and energy was used could we fire something at the moon and hit it? In theory that is at least.