How the Universe Works

Season 5 Episode 2: Mystery of Planet 9

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.

Genre:

Documentary

Seasons:

11

Episodes:

93

Cast:

Quality:

HD

Duration:

42 min

First Air:

2010

Rating:

8.3