Photo: Comet Impacts Triggered Ice Age Extinctions?



Comet Hale-Bopp streaks across the skies over Japan's Mount Fuji in March 1997.

Pygmy mammoths, saber-toothed cats, and some of the earliest Americans may have been killed by climate change set off by a comet bombardment 12,900 years ago, a July 2009 study suggests.

Photograph from AP/Kyodo News


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