How the Universe Works 5

Most Amazing Discoveries (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.

Mystery of Planet 9 (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.

Black Holes: The Secret Origin (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.

Secret History of Pluto (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.

Stars That Kill (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.