Captive

A third theory suggests that the moon was formed independently and far from the earth, but was later captured by the earth's gravitational pull when it came too close.

This theory can account for the differences in composition between the earth and the moon, but it does not explain how the earth could have grav-itationally captured such a large moon. Indeed, attempts to model this scenario with computer simulations have failed. Moreover, while the theory accounts for some of the chemical differences between the earth and moon, it does not explain the many chemical similarities that also exist.

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