system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do the planets of our solar system seem to share a rotational plane?

Does it have to do something with an axis the sun spins on?
gpt
They were all formed out of the same accretion disk (stuff rotating due to gravity), so when that cloud of dust was collapsing, it collapsed into the same rotational plane, all going pretty much in the same direction.