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A huge space rock called Theia smashed into our planet more than four billion years ago, knocking a clump of material into space, creating the moon – at least that's the theory.
There's just one problem: there's no evidence that Theia was there at all.
A new study has found no trace of Theia in rocks from the moon – leaving scientists to puzzle over how our satellite got there without a Mars-sized object slamming into the young Earth.
The ancient impact with…
see link– http://alien-ufo-community.ning.com/forum/topics/evidence-the-moon-was-brought-to-our-solar-system