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Watch NASA's Unexplained Files Season 2 Online

  • 7/10
  • COUNTRIES: United States of America,United Kingdom,India
  • Subtitles: English

A UFO crashes in Pennsylvania. Was it a secret Soviet satellite or something far more dangerous? On Mercury, NASA finds the impossible: frozen water. A strange object causes a skyscraper-sized shadow on the surface of Mars's largest moon. What is it?