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Unsealed: Alien Files: Season 4

4x18 Alien Communications

  • 2015-12-02T02:00:00Z on History
  • 20m
  • United States
  • English
  • Documentary, Reality
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?
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