How the Universe Works (2010 – ...)

2010 • 11 seasons • Documentary • TV-PG

8.9/10 7,698

83% 117

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On August 9, 2026

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20.9 Attention Score

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Episode 2 — Mystery of Planet 9

Name: Episode 2 — Mystery of Planet 9
Released: 2016-11-29
Duration: 42 min
Rating: 8

Season 5 • How the Universe Works

Released: 2016-11-29 • Documentary

80%

User score

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.

Where to Stream Episode 2

Season 5 · Episode 2 · Streaming in USA

Episodes

Episode 1
Most Amazing Discoveries
2016-11-22

Episode 2
Mystery of Planet 9
2016-11-29

Episode 3
Black Holes: The Secret Origin
2016-12-06

Episode 4
Secret History of Pluto
2017-01-03

Episode 5
Stars That Kill
2017-01-10

Episode 6
The Universe's Deadliest
2017-01-17

Episode 7
Life and Death on the Red Planet
2017-01-24

Episode 8
The Dark Matter Enigma
2017-01-31

Episode 9
Strangest Alien Worlds
2017-02-07

Information

Episode air date	29.11.2016
Episode runtime	42 min
Episode rating	8.00
Genres	Documentary
TMDB series rating	8.3
IMDb series rating	8.9
Series status	Returning series
Age rating	6+
Country	US

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