Naked Science - Close Encounters

Seizoen: 2 - Aflevering: 12 / 25 - Eerst uitgezonden: 17 december 2005 - Episode ID: 191579

Has planet Earth ever had a close encounter with aliens? NGC explores significant UFO sightings, interstellar travel, whether ETs could survive on Earth, interspecies communication, alien abduction cases, and whether life on Earth originated in space.