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The round (spherical) shape of a planet comes about through the force of gravity, not through wind, but the rotation does have an effect on its shape.

Mass is related to gravity, the more massive an object is the bigger the force of gravity at its surface. If an object is around 700-1000km in diameter (roughly) then it will have enough gravity for it to shape itself into a ball shape, overcoming the internal forces that would otherwise give it an irregular shape. A object (like a moon, dwarf planet or planet) has to be large enough and massive enough to 'pull' itself into a spherical shape.

The spin of the object may cause the spherical shape to become squashed, if it is fast enough, as the centripetal forces at the equator will stretch it out somewhat.

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Related Questions

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