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12 years ago
Why is the impact theory now preferred as an explanation for the Moon's origin? 
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12 years ago
The capture theory is unlikely for a body as big as the Moon, while the coformation theory would have the Moon orbit our equator as it condensed.  The impacting body would be of different composition than the earth, and the heat of impact would drive off the lighter materials, as noted for the Moon's crust.  The body would also have been moving in the ecliptic plane before impact, and the Moon still orbits close to the ecliptic even now. 
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