Why are galaxies round as a pizza instead of round like a sphere?
In: Physics
They start out as a bunch of things revolving around a central point, and it looks like a sphere. However, it does not move like a spinning sphere; if you spin a sphere, only an infinitely-thin circular piece of it revolves around the center.
Over time, all these random intersecting orbits make the objects crash onto each other or pull gravitationally on each other, and all that’s left are the circular paths which don’t intersect, which is pizza-shaped.
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