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PBS SPACE TIME

S2 Ep21: Are We Alone? Galactic Civilization Challenge

Everything we’ve learned about our universe tells us that it is very unlikely we are alone
  • Premiere Date: Aug 07th, 2017
  • Rating: NR
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S2 Ep21: Are We Alone? Galactic Civilization Challenge

Everything we’ve learned about our universe tells us that it is very unlikely we are alone (6:19)
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