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NASA's Unexplained Files Season 4 Episode 6

Did Earth Have Two Moons?

A discovery suggests the hellish clouds of Venus may be the origin of life on Earth. A bizarre sighting 2,000 years ago raises the possibility that Earth once had two moons. A scientist helps the FBI crack the 1996 Olympic bombing.

NASA's Unexplained Files Season 4 Episode 6
Oct. 04, 2016