New discoveries reveal the secrets of the most distant and mysterious worlds in the solar system. This episode of is a mashup of "How the Universe Works" S05E03 "Secret History of Pluto" and S05E01 "Mystery of Planet 9."
New discoveries reveal the secrets of the most distant and mysterious worlds in the solar system. This episode of is a mashup of "How the Universe Works" S05E03 "Secret History of Pluto" and S05E01 "Mystery of Planet 9."
Retitled, this episode re-aired on 12/17/2018 at 2100 as "Pluto & Beyond: The Alien Mysteries" with a summar of "New findings reveal the secrets of the mysterious worlds at the edge of our solar system."