The Moon is an astronomical body that orbits planet Earth, and is Earth's only permanent natural satellite. It is the fifth-largest natural satellite in the Solar System, and the largest among planetary satellites relative to the size of the planet that it orbits (its primary).

The Moon have formed about 4.51 billion years ago, not long after Earth. It is formed from the debris left over after a giant impact between Earth and a Mars-sized body called Theia.


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