I've been wondering... Is there some kind of set intergalactic law system for space?
In other words, if for example, the US discovers a reachable habitable planet alike to Earth, who would get first dibs as to invading/claiming that planet?
Would the US own the planet? Would it be a world shared planet? etc
and what happens if we discover life forms on other planets? Who gets to talk to them? etc
and finally, does law even apply in space? Seeing as no one 'owns' space, if you were to commit a murder in space then whose court/legal system would you be prosecuted under?
I know this is all very abstract, but I was just wondering if there are any laws etc in place for this kind of thing? Or just for space in general?