Could someone explain how orbits are so flat? For example, why do most of the planets orbit on the same plane instead of randomly? Why are galaxies flat instead of spherical? Gravity forms matter into a ball (planets, stars, etc..) so why not orbits?
In: Physics
Planets are spheres because they’re full of stuff. Orbits are flat because they’re full of empty space. The orbiting stuff will stay distant in the plane of spin, but otherwise will try to get closer, until the ball compresses to something disk like. A planet can’t do this because it’s full of stuff, not space.
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