system
Given the following post, respond as if you're commenting on Reddit:
human
Why do the planets seem to be semi-limited to one plane? Why do some planets not orbit “upwards” around the sun?
gpt
Because of how solar systems form.

They start with a cloud of gas which begins to compress under its own gravity. Since gas moves randomly, there are always a few more particles moving in one direction than in any other, forcing the whole cloud to spin in that direction faster and faster as it compresses.

Centrific force then causes the cloud to concentrate around the axis of rotation, forming a disc. From that disc you get planetary orbits.