Comet Wiped Out Early North American Culture, Animals, Study Says

Publication: National Geographic News   Date: May 23, 2007   View Article

A comet exploded over North America about 13,000 years ago, causing a long bout of climate cooling, according to a controversial new theory presented today.

The extraterrestrial impact may help explain massive mammal die-offs and the demise of one of the earliest American cultures.

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