The Moon is an astronomical body orbiting Earth
as its only natural satellite. It is the fifth-largest satellite in the Solar
System, and by far the largest among planetary satellites relative to the size
of the planet that it orbits (its primary).
The Moon is thought to have formed about 4.51
billion years ago, not long after Earth. The most widely accepted explanation
is that the Moon formed from the debris left over after a giant impact between
Earth and a hypothetical Mars-sized body called Theia.
(C)DYPOSR
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