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The prevailing theory at present is some form of early impact with the partly-cooled Earth. This may have been a co-orbiting object that fused with the Earth after the collision, but that blasted loose the material which later formed the Moon.

(see the related question)
the moon isn't as old as the Earth and was formed approximately 30-50 million years after the Solar System based on what is called 'the giant impact theory'.

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11y ago

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