Quote:
Originally Posted by Bynaus
There are no good constraints on the core of Venus. It could be as large as the Earths, even a little bit larger (relatively speaking). Besides, a large iron core is hardly indicative of a giant impact origin of the moon: where would all the non-iron material have gone, if, say, Earth and Theia had comparable core mass fractions? The moon has only ~1% of the Earths mass, so this doesn't really make any difference.
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The Moon has a significantly lower density than Earth. This is due to most of the cores of both the proto Earth and the impactor remaining with the Earth.
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