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Watch Unsealed: Alien Files Season 4 Episode 18 Online

  • 6.7/10
  • COUNTRIES: United States of America
  • Subtitles: English

Scientists and Ufologists are scouring the vast regions of space for signs of extraterrestrial life. But if it takes millions of years for light from distant stars to reach Earth, how long could it take for aliens to answer our call?