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Modern thought has it that a body about the size of Mars, and given the name of Theia, collided gently with the Earth, and the debris from the collision resulted in the formation of the Moon.

Thus much of its rocks are similar to those of Earth, but it is mineral deficient. Earth's core was likely not involved in the collision.

The Moon obviously has an uneven distribution of mass, and that is why the Moon presents one face to Earth all the time. It probably had significant spin at some time, but tidal drag with the Earth has canceled this out.

1 earth mass = 81.78 moon mass (rounded)

1 moon mass = 0.01223 earth mass = 1.223% of earth mass (rounded)

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14y ago

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