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Gravity is the force that makes the Sun and planets roughly spherical in shape. Their rotation, if fast enough, will cause their equators to bulge and their poles to be somewhat flattened.

The sphere is the perfect shape in nature for all fluids. Any body of fluid acted upon only by its own gravity will assume the shape of a sphere, where every point on the surface is equidistant from the center of gravity.

Objects in the solar system are composed of gas, ice, and rock. If they are large enough, they reach "hydrostatic equilibrium" in which their matter is forced together by gravity into a spherical or ellipsoid shape.

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9y ago

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