Did a comet swarm strike America 13,000 years ago?
via newscientist.com
Add a new suspect to the list of what might have killed the ice-age megafauna of North America – a barrage of debris from a disintegrating comet. Instead of a four-kilometre comet blowing a single crater in the North American ice sheet 13,000 years ago, the infalling debris would have filled the sky with a series of megatonne-scale explosions like the Tunguska event of 1908.
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