Cosmos: Possible Worlds is premiering the first episode of its third season on Monday, Mar. 9 at 8 p.m. The series is hosted by Neil deGrasse Tyson, and produced by Seth McFarlane. There are ...

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Neil DeGrasse Tyson returns as host for the third season of 'Cosmos: Possible Worlds.' Watch it on National Geographic.

Neil DeGrasse Tyson returns as host for the third season of 'Cosmos: Possible Worlds.' Watch it on National Geographic.