Pluto is the subject, with an investigation into whether the planet has an underground ocean. 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 harbour life.
This episode is a mashup of S05E04 and S05E02
This episode is a mashup of S06E01 and S05E03
This episode is a mashup of S06E03 and S04E04
This episode is a mashup of episodes S06E04 and S03E07
This episode is a mashup of S06E05 and S05E04.
This episode is a mashup of S06E06, "Secret History of Mercury", and S04E02, "Earth, Venus's Evil Twin".
This episode is a mashup of S06E07, "The Quasar Enigma" and S05E06, "The Universe's Deadliest".
This episode is a mashup of S06E08, "Strange Lives of Dwarf Planets", and S05E09, "Strangest Alien Worlds"
This episode is a mashup of "How the Universe Works", S06E09, "War on Asteroids", and "Strip the Cosmos", S01E03, "Killer Asteroids"
This episode is a mashup of S06E04, "Death of the Milky Way", and S03E07, "Did a Black Hole Build the Milky Way?".
This episode is a mashup of S05E04, "Secret History of Pluto", and S05E02, "Mystery of Planet 9".
This episode is a mashup of S07E01, "Nightmares of Neutron Stars", and S05E05, "Stars That Kill".
This episode is a mashup of S07E02, "When Supernovas Strike", and S01E06, "Supernovas".
This episode is a mashup of S07E03, "The Interstellar Mysteries", and S06E10, "Mystery of Spacetime".
This episode is a mashup of S07E05, "Secret World of Nebulas", and S01E04, "Stars".
This episode is a mashup of S07E06, "Did the Big Bang Really Happen?", and S03E04, "First Second of the Big Bang".
This episode is a mashup of S07E07, "Battle of the Dark Universe", and S05E08, "The Dark Matter Enigma".
Some of the brightest minds and theorists on the planet explore the limits of human knowledge and explain the science behind the rules of the universe.
New scientific discoveries reveal that the moon has an incredible, violent, and dynamic history. Was the moon originally more similar to earth than previously thought?