Episode guide

S5·E2 Mystery of Planet 9

Core Aired November 29, 2016

Synopsis

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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Frequently Asked Questions

When did Season 5 Episode 2 of How the Universe Works air?

Season 5, Episode 2 ('Mystery of Planet 9') originally aired on November 29, 2016.

How long is Season 5 Episode 2 ('Mystery of Planet 9')?

The episode follows the standard broadcast runtime for How the Universe Works.

What happens in How the Universe Works Season 5 Episode 2?

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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