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Astrophysicist Neil deGrasse Tyson speaks with CNN over the years about a wide variety of otherworldy topics including aliens, UFOs, life on Mars and more. 0:00 The Best of Neil deGrasse Tyson 0:19 Hear what surprised Neil deGrasse Tyson about purported ‘alien' corpses 2:41 UFO doesn't automatically mean aliens 7:53 What would aliens say ...
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