Season 5
9 episodes · Nov 22, 2016
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S5E1Most Amazing Discoveries
Nov 22, 201642mFrom the furthest reaches of space to our own cosmic backyard, we count down the discoveries that changed everything we know about our universe.
S5E2Mystery of Planet 9
Nov 29, 201642mScientists 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.
S5E3Black Holes: The Secret Origin
Dec 6, 201642mRecent 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.
S5E4Secret History of Pluto
Jan 3, 201742mThe 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.
S5E5Stars That Kill
Jan 10, 201742mThe 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.
S5E6The Universe's Deadliest
Jan 17, 201742mThe 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.
S5E7Life and Death on the Red Planet
Jan 24, 201742mLife 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.
S5E8The Dark Matter Enigma
Jan 31, 201742mDark 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.
S5E9Strangest Alien Worlds
Feb 7, 201742mDiscoveries 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?