We’re being invited to junk the theory that our Moon formed after an impact between the Earth and a Mars-size planetoid in the early days of the solar system, 4.5 billion years ago. Some guys have been playing around with a computer and they’ve found that a Moon-size object can be formed from the rings of debris thrown off the Earth by around 20 small-scale collisions.
They say the single-impact theory doesn’t work as material brought back from the Moon is essentially the same as rocks found on Earth. But why should that single, Mars-size object be too different from the Earth if it formed in the same region of space out of the same material?
And after 4.5 billion years of homogenization, how is anyone going to be able to tell what, in an unholy mixture, is original material from planet Earth and what came from the assailant?
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