Poster of Cast and Crew in How The Universe Works - Season 5 - Episode 2 - Mystery of Planet 9

How The Universe Works - Season 5 - Mystery of Planet 9 (Episode 2)

Plot: 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
Episode Aired On:
Tuesday, November 29 2016
8 years ago