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All planets are spherical, why are they ...

All planets are spherical, why are they not cubical or cylindrical?

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Two types of forces are always acting on a planet. One is centripetal force acting inwards and the other is centrifugal force acting outwards. The shape of a planet is determined by the combined effect of both these forces so as to attain minimum energy. For a given volume the surface energy for a sphere is minimum than that for other shapes. Hence the planets are spherical in shape.
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