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Watch Crash Course Big History Season 1 Episode 2 Online

  • 6/10
  • COUNTRIES: United States of America
  • Subtitles: English

In which John Green, Hank Green, and Emily Graslie teach you about what happened in the Universe after the big bang. They'll teach you about cosmic background radiation, how a bunch of hydrogen and helium turned into stars, formed galaxies, created heavy elements, and eventually created planets.