Known Universe: Cosmic Collisions



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Known Universe : http://channel.nationalgeographic.com/series/known-universe/all/Ove... Could an asteroid impact with Earth wipe out the human race?
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* Documentary

Tags: Collisions, Cosmic, Documentary, Earth, Known, Laboratory, Lunar, Planetary, Universe, asteroidvideo, More…cosmic, cosmic-collisions, earth, education, emergingmagazine, nationalgeo, outerspace, science, universe

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