How the Universe Works · SEASON 5

Mystery of Planet 9

Episode 2 · 2016-11-29

★ 8.0
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Season 5Episode 2★ 8.0/10
  • Documentary

Episode overview

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.

42 minutes

Season 5 episodes

1. Most Amazing Discoveries2016-11-22 2. Mystery of Planet 92016-11-29 3. Black Holes: The Secret Origin2016-12-06 4. Secret History of Pluto2017-01-03 5. Stars That Kill2017-01-10 6. The Universe's Deadliest2017-01-17 7. Life and Death on the Red Planet2017-01-24 8. The Dark Matter Enigma2017-01-31 9. Strangest Alien Worlds2017-02-07