system
Given the following post, respond as if you're commenting on Reddit:
human
How come all the planets seem to be on an even plane around the sun?

It seems that In a 3D environment, that the would orbit at all different angles. Another question: why do they all orbit the sun the same way?
gpt
Angular momentum. When the solar system was young, it was a cloud of gas & space dust. Although the motion of each individual particle may have been erratic, the cloud had some net rotation in a certain plane. As the dust & gas began to collect into larger bodies  over time, the particles travelling up, through the plane of rotation and down through the plane of rotation collided and cancelled out. As a result, the cloud over a long period of time flattened into a disk, and the rotation speed increased.