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Stream the full Cosmos A SpaceTime Odyssey Season 2 Episode 5 movie online for free in crystal-clear HD quality. No downloads required—just press play and enjoy the action, complete with English subtitles for an enhanced viewing experience.

The keys to the cosmos have been lying around for us to find all along. Light, itself, holds so many of them, but we never realized they were there until we learned the basic rules of science.