TheMoon(inGreek:σελήνηSelene, inLatin:Luna) isEarth's onlynatural satellite.It is one ofthe largest natural satellites intheSolar System, and, among planetary satellites, the largest relative to the size of the planet it orbits (itsprimary).It is the second-densestsatellite among those whose densities are known (afterJupiter's satelliteIo). The Moon is thought to have formed approximately 4.5 billion years ago,not long after Earth. There are several hypotheses for its origin; the most widely accepted explanation is that the Moon formed from the debris left over after agiant impactbetween Earth and aMars-sized body calledTheia.
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Smiley @ RobVanDarm
Smiley @ RobVanDarm