Quote:
Originally Posted by Hemi-Cuda
a meteor of that size? a rock that's a fraction of the size shown in that simulation would be enough to cause the mass extinctions that we know about. but something the size of a small moon hitting the Earth would wipe out all life on the planet, and i'm guessing could even throw off the orbit so that life couldn't return
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Actually one theory has one hitting the Earth the the subsequent debri created the Moon