When astronaut Leroy Chao?s high-risk spacewalk is interrupted by bright lights flying past, it sparks a major investigation. Could alien life forms be to blame?

The Viking Lander may have found life on Mars. Meanwhile, how could a Starship be spotted in the Aurora Borealis? And what exactly are NASA?s mysterious Moon Pigeons?

The Hubble Telescope spots thousands of unidentified objects travelling faster than light. Are we being watched? Or could we ourselves be aliens from another world?

A planet shows evidence of an Earth-like atmosphere, while a mysterious glowing light suggests the impossible: an atmosphere on the Moon. Plus, why are there blueberries on Mars?

Could spaceships really be powered by atomic bombs? Plus, why was Neil Armstrong?s transmission feed cut off when he spotted strange lights on the Moon?

Test pilot Gordon Cooper is preparing to test a radical new landing system in a lakebed when two UFO?s appear. Also, the mystery of Saturn?s mega-hex.

A look is taken at exclusive NASA footage and firsthand accounts of mysterious fly objects from astronauts and scientists are presented.