Neil deGrasse Tyson on Time Travel and Time Travelers

Does the fact that there are no time travelers now prove that time travel will never be invented in the future? Neil deGrasse Tyson, astrophysicist, host of StarTalk Radio and director of the Hayden Planetarium, answers this Cosmic Query from +FraserCain of UniverseToday in this Behind the Scenes video. With comic co-host Colin Jost of Saturday Night Live Weekend Update.

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