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Lec 7 - Catastrophic Impacts in Earth's History

"Lec 7 - Catastrophic Impacts in Earth's History" (February 2, 2010) David Morrison, NASA Lunar Science Institute, discusses the discovery of the cretaceous catastrophe that caused the last mass extinction and explains NASA's research on the danger of similar events occurring in Earth's near future. Stanford University: http://www.stanford.edu/ Stanford University Channel on YouTube: http://www.youtube.com/stanford

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