Can you fire a Gun in Space?• Guns don’t require oxygen to work, so the vacuum of outer space will not be a problem. The gunpowder is completely self-contained and doesn’t depend on the atmosphere. The gun will work better in space. The bullet will not have to compress or push the air in the barrel, and it can travel infinite distances in space.
• Because it is in space, it will curve eventually. The orbit of the bullet will be different (depending on speed and position of the bullet) from the orbit of the person who fired it. Firing in the straight direction of orbit will result in an eccentric orbit, and because the Universe is expanding continuously (73 kilometres per sec per megaparsec), the bullet will never stop and will travel forever alone.
• On the moon, if you fire a powerful gun (of 1,600 m/s bullet speed) at the horizon and then wait for a while, you can get hit in the back of the head.
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