Why are planetary rings orbit only the equator or usually follow the same plane just like our solar system?
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Well, it would take more time than I have to completely detangle your question(s).
First, rings/moons around a planet and planets around a star generally line up in a plane due to conservation of angular momentum during the formation of the solar system or ring/moon system. This, combined with the gravitational attraction between the bodies tends to keep them in the same plane.
However, there are exceptions like Pluto, or the Oort cloud objects. Because of their distance from the center of the solar system, they are less influenced by the centralized mass of the solar system (primarily the Sun).
The magnetic field has very little effect at large distances, since it's force falls off as the cube of the distance, whereas the force of gravity falls off only as the square of the distance.
first, it's probably not good to compare saturn's rings to the oort cloud. the oort cloud is just to thinly populated.
planetary rings likely form from the collision of moons and ?
when that happens, debris is scattered widely.
some is ejected from the planet. some falls to the surface. some circles the planet, roughly in the plane of the moons. when pieces collide they don't "bounce" like rubber balls. over time, the collisions cause them to be in a single plane.
while i'm not sure, i seriously doubt that magnetism has anything to do with it. if it did, it would probably "fight" gravity to some extent, and that would likely decay the orbits.
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