@jernej__s @adamshostack
You can shoot a gun in space.

It will fire: Modern ammunition contains its own oxidizer, so a gun doesn't need atmospheric oxygen to work.

The bullet travels forever: Without air resistance or gravity, a fired bullet will travel indefinitely in a straight line until it hits something.

You will be pushed backward: Newton's third law means the recoil will propel the shooter in the opposite direction, potentially sending them drifting uncontrollably.

It's been done: The Soviet Union test-fired a 23mm cannon on the Salyut-3 space station in 1975.

So, while it's possible, the consequences—like creating eternal space debris or being flung backward—make it a very bad idea