Home / Series / TED Talks / Aired Order / Season 2018 / Episode 221

Stephen Webb: Where are all the aliens?

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.

  • Originally Aired July 19, 2018
  • Runtime 15 minutes
  • Production Code StephenWebb_2018
  • Original Network YouTube
  • Parental Guideline TV-PG
Name Type
Stephen Webb Guest Star

Missing Information

TheTVDB is an open database, meaning that if information or images are missing, you're welcome to log in and add the information yourself.

  • This episode is considered complete!