Like the saturn ring, why isn’t it surround the whole planet or the general shape of milky way galaxy is pretty much like a disc
Or the solar system
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[Here’s a good video about it.](https://www.youtube.com/watch?v=tmNXKqeUtJM) It’s easier to understand with the graphics. But the basic reasons why spiral galaxies, planetary rings, and even the way all the planets travel around the sun on a mostly flat plane has to do with gravity vs angular momentum. Particles are attracted by gravity, and they also have angular momentum from being pulled by this gravity around the source. How that gravity is distributed will influence how the particles are moving. So if you have a mass of particles going in a lot of directions, they will all be pulled towards the center of where they all are because that’s the center of the gravity for the system. As they collide together, they eventually all balance out into a disk, which is what we see in something like a planetary ring.
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