"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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Tags: science biology astrobiology physics geology history organic chemistry earth catastrophe life mass extinction fossil comet asteroid marine sediment extra-terrestrial material cretaceous NASA conspiracy theory ask an astrobiologist fain
Duration: 80m 5s
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