Comet May Have Exploded Over North America 13,000 Years Ago

New scientific findings suggest that a large comet may have exploded over North America 12,900 years ago, explaining riddles that scientists have wrestled with for decades, including an abrupt cooling of much of the planet and the extinction of large mammals.

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<p><a href="http://www.physorg.com/news106410997.html">Comet May Have Exploded Over North America 13,000 Years Ago</a></p> <p>New scientific findings suggest that a large comet may have exploded over North America 12,900 years ago, explaining riddles that scientists have wrestled with for decades, including an abrupt cooling of much of the planet and the extinction of large mammals.</p>