Was the moon split into two parts at a certain time?

I’m not sure what you[re referring to, but the current theory is that the Moon is the result of a collision with early Earth and a Mars-sized planetessimal.   Early on when the Earth was completely molten, the heavier elements (iron, etc.) were falling to the center of the Earth leaving behind a less-dense outer layer/crust.  When the collision happened, it ripped off that outer most layer and was flung out into orbit around Earth and eventually came together to form our Moon.  This is the reassemble it, it is the result of two bodies collided with one another!

Brad Bailey

NLSI Staff Scientist

August 3, 2009

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The last human visitor left the Moon in December 1972.

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