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Secret History of Pluto
How the Universe Works - S5 - E4
The first close-up images of Pluto revealed unimaginable secrets of this mysterious frozen world. Now, scientists investigate if Pluto is home to a warm ocean of liquid water beneath its surface, and whether this underground ocean could harbor life.
How the Universe Works: Season 5 - 9 Episode s
5x1 - Most Amazing Discoveries
November 22, 2016
From the furthest reaches of space to our own cosmic backyard, we count down the discoveries that changed everything we know about our universe.
5x2 - Mystery of Planet 9
November 29, 2016
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.
5x3 - Black Holes: The Secret Origin
December 6, 2016
Recent discoveries could explain how supermassive black holes grow so big, one of the universe's most mysterious questions. Neither dark matter nor cannibalism can fully explain these monsters, but the latest science might finally provide an answer.
5x4 - Secret History of Pluto
January 3, 2017
The first close-up images of Pluto revealed unimaginable secrets of this mysterious frozen world. Now, scientists investigate if Pluto is home to a warm ocean of liquid water beneath its surface, and whether this underground ocean could harbor life.
5x5 - Stars That Kill
January 10, 2017
The universe is home to real-life Death Stars that could destroy planet Earth. The latest science reveals the terrifying secrets of NASA's six deadliest: vampire stars, supernovas that can vaporize a planet, and unpredictable stars gone rogue.
5x6 - The Universe's Deadliest
January 17, 2017
The universe is a dangerous place, and we explore the deadliest spots in the cosmos. Between earth and the edge of the universe, there are a million ways to die, and our crash test dummy is on a mission to reveal the worst.
5x7 - Life and Death on the Red Planet
January 24, 2017
Life once existed on Mars, but a series of devastating mass extinctions have made present-day life nearly impossible. The latest science shows how Martian life keeps bouncing back as it transforms from a watery world like Earth into a desert planet.
5x8 - The Dark Matter Enigma
January 31, 2017
Dark matter is the biggest mystery of the cosmos. Scientists know that it has been vital to our universe since its birth, and new discoveries reveal that it could create black holes, cause mass extinctions, and might even shape life on Earth itself.
5x9 - Strangest Alien Worlds
February 7, 2017
Discoveries of new planets have revealed countless worlds much stranger than Earth. Some of these worlds don't have stars, others are made out of diamonds. Will we ever find a planet like Earth, or are these distant worlds stranger than fiction?