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How the Universe Works: Season 5

5x02 Mystery of Planet 9
TV-PG

  • 2016-11-30T02:00:00Z on Science
  • 42m
  • United States
  • English
  • Documentary
Scientists have discovered a mysterious ninth planet on the very edge of our solar system. Ten times the size of Earth, this strange world could have moons with extraterrestrial life.
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