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The Moon certainly ain't made of cheese but it may be made of more metal than previously thought, sensor shows

Nick Ryan Silver badge

I don't entirely understand how this disproves the early collision theory. Even if both proto-Earth and Theia disintegrated into tiny parts with the collision, the chances of the ratio of parts being the same when they eventually coalesced into the Earth and Moon is pretty slim. Alternatively what if Theia was made of a little more metal than the Earth and it was more of a glancing blow than a complete destruction? Surely in this instance it would maintain more of its original material?

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