Neil deGrasse Tyson Speaks On Nat Geo's "Cosmos: Possible Worlds"

The most-watched science show on the planet, "Cosmos," returns for its newest season with "Cosmos: Possible Worlds." The brainchild of creator, executive producer, director and writer Ann Druyan, this season continues the legacy Druyan began with Carl Sagan 40 years ago. Hosted by astrophysicist Neil deGrasse Tyson, the show is a wonder-filled journey that maps a hopeful vision of our future.