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Watch NASA's Unexplained Files Season 4 Episode 6 Online

  • 6.983/10
  • COUNTRIES: United States of America,United Kingdom,India
  • Subtitles: English

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.