The best of Neil deGrasse Tyson: Aliens, UFOs, asteroids & more

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 about Earth? 12:58 What NASA's discovery means for life beyond Earth 16:07 When will we get to Mars? 20:52 Neil deGrasse Tyson on whether there is life out there 27:26 What can sample taken from asteroid that may hit earth in 2182 tell us? 31:15 Neil deGrasse Tyson to govt.: 'Bring out the alien'

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