The last really big extinction event was at the end of the Cretaceous period, 65.6 million years ago. A giant asteroid, about 10 km in size, hit the Earth and caused the extinction of dinosaurs.

Depending on where the asteroid hit, this could have a number of implications:

if the asteroid hit on land, an enormous shock wave much like multiple hydrogen bombs going off. If it was in the water,... more

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James Vardini
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