Ever notice that you can’t pile sand straight up really high? Eventually it just collapses into a pile. Well, thinks like trees and building manage to get higher because they’re stronger materials than sand, but if they get big enough, they still can’t hold up their own weight, and collapse into a pile. It happens to everything.
And out in space, what things collapse into are spheres. Gravity makes everything want to get to the center of the pile, and a sphere is the most efficient way to get everything as close to the center as it can get.
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