The universe is incredibly old, astoundingly vast and populated by trillions of planets — so where are all the aliens? Astronomer Stephen Webb has an explanation: we're alone in the universe. In a mind-expanding talk, he spells out the remarkable barriers a planet would need to clear in order to host an extraterrestrial civilization — and makes a case for the beauty of our potential cosmic loneliness. "The silence of the universe is shouting, 'We're the creatures who got lucky,'" Webb says.

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  • Episode Number 221
  • DVD Season & Episode Number
  • Absolute Episode Number
  • Originally Aired Thursday, July 19, 2018
  • Production Code StephenWebb_2018
  • Directors
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  • Guest Stars Stephen Webb
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  • Last Updated By Pond247
  • Last Updated 03/28/2019 3:09pm