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Planets are NOT elliptical in shape, they are basically spheres. However their spherical shape is distorted by the centrifugal forces resulting form their spin. This makes their equators fatter and their shape becomes that of an "Oblate Spheroid".

All of the planets are spherical; none are appreciably oblate. In fact, being spherical is one of the elements of the 2006 IAU definition of "planet".

Probably the biggest deviation from spherical is the mountain Olympus Mons on Mars; it is the highest mountain that we know of in the solar system. However, our exploration of Venus and Mercury are still in the very early stages; there are many surprises yet to be found there.

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10y ago

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