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Posted March 23. 2013 12:36PM

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

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"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]