Watch Episode #3 of Cosmos with Neil deGrasse Tyson: “When Knowledge Conquered Fear” (US Viewers)

Last week’s episode of the Cosmos reboot saw Neil deGrasse Tyson giving Fox viewers a lesson in evolution, a lesson that ended with the quiet but emphatic declaration: “The theory of evolution, like the theory of gravity, is a scientific fact. Evolution really happened.” This week Tyson, the astrophysicist who directs the Hayden Planetarium, introduced viewers to some subjects he holds near and dear: comets and gravity, the work of Edmond Halley and Isaac Newton, and how they changed our understanding of the world.

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