system
Given the following post, respond as if you're commenting on Reddit:
human
Why do the planets orbit the sun on a flat plane?

Why don't they look similar to electrons orbiting an atom?
gpt
1. Our Solar System was a big blob of gas and dust, and it wasn't ordered in any big way. There was a little bit of rotation.

2. Gravity pulled the blob together, and by conservation of angular momentum that small amount of rotation was magnified, like a skater whose rotation speeds up as they pull their arms in.

3. Now the whole thing is mostly spinning around an axis; the orbits won't all be around the same axis but over time collisions will even them out. It's looking more like a cylinder now.

4. The cylinder flattens along its axis because that's the direction where gravity is unopposed by the rotational inertia of the debris. Bam, you've got a disk. It clumps together into planets and moons because of gravity.