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A Big Splat in the Asteroid Belt Doomed Earth's Dinosaurs

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Science  07 Sep 2007:
Vol. 317, Issue 5843, pp. 1310
DOI: 10.1126/science.317.5843.1310

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Summary

A chance encounter between two huge chunks of rock in the asteroid belt reached out across 100 million years and 200 million kilometers to snuff out 90% of Earth's marine species, as well as the dinosaurs, 65 million years ago, according to a new analysis.

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