Planets are round because their gravitational field acts as though
it originates from the center of the body and pulls everything toward it.
With its large body and internal heating from radioactive elements,
a planet behaves like a fluid, and over long periods of time succumbs
to the gravitational pull from its center of gravity. The only way to get all
the mass as close to planet's center of gravity as possible is to form a sphere.
The technical name for this process is "isostatic adjustment."
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