Neil deGrasse Tyson Knows How The World Will End

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Neil deGrasse Tyson talks to Stephen about how the world will end and why the idea of "The Big Rip" keeps him awake at night. Unlock more mysteries of the universe in his new book, "Cosmic Queries: StarTalk's Guide to Who We Are, How We Got Here, and Where We're Going." #Colbert #CosmicQueries #NeildeGrasseTyson