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One theory is that the earth and moon were originally one planet, but that something (perhaps a collision from another large body) caused it to split into two unequal parts. Neither part, obviously, was originally spherical, but centripetal forces and gravity, over thousands, perhaps millions, of years, shaped them into spheres. A variant on this theory has one or both of the bodies being completely obliterated by the impact, then eventually pulled back together, by gravity, into two separate bodies. == See the linked question below [Is the moon artificial] for some other possibilities for the origin of the moon.

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17y ago

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