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The first rocks on the moon would have formed fairly soon after the accretion of material occurred following the collision between the Earth and the planetesimal with which it collided, roughly 4.5 billion years ago. Being a smaller celestial body, the surface of the moon cooled quicker than the surface of the Earth. The oldest Earth rocks discovered so far date to about 3.9 billion years ago. The oldest moon rocks would therefore be between 4.5 and 3.9 billion years of age.

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