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Watch How the Universe Works Season 2 Episode 3 Online

  • 8.179/10
  • COUNTRIES: United States of America
  • Subtitles: English

We once thought that the only planets were in our solar system. We have found many other planets but they are nothing like we expected, from deep-frozen, toxic snowballs, to scorched and boiling nightmares. Is every planet out there a planet fom Hell?