8. Catastrophic Impacts in Earth's History
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27 Jun 2019
(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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