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March 23. 2013 12:36PM

Dartmouth researcher: Comet, not meteor may have triggered dino extinction

"How do we get something that has enough energy to generate that size of crater, but has much less rocky material? That brings us to comets," study author Jason Moore, a paleoecologist at Dartmouth College in New Hampshire, told BBC News. [Meteor Crater: Experience an Ancient Impact]

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