Venus, Earth and Mars, the solar system's most tragic love triangle. In this story of luck and loss, we explore the physics that drove their destinies apart, and speculate on alien life that may have clung on in the meantime.

NOTE (spoiler alert): The Alien Interludes in this episode are based on real concepts for extra-terrestrial life in science fiction: the Picknia are based on the Cheela from the novel Dragon's Egg by Robert Forward, Mariplasma resembles the Amoebic Sea from the Discovery Channel special Alien Planet, and the Harmonia are pretty much exactly as described by Kurt Vonnegut in his fantastic sci-fi novel Sirens of Titan (please just put down your phone and go and read this book).

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