Largest Ever Killer Crater Found Under Ice in Antarctica

Planetary scientists have found evidence of a meteor impact much larger and earlier than the one that killed the dinosaurs -- an impact that they believe caused the biggest mass extinction in Earth's history.

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<p><a href="http://www.physorg.com/news68455520.html">Largest Ever Killer Crater Found Under Ice in Antarctica</a></p> <p>Planetary scientists have found evidence of a meteor impact much larger and earlier than the one that killed the dinosaurs -- an impact that they believe caused the biggest mass extinction in Earth's history.</p>