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.Want to help shape TED’s shows going forward? Fill out our survey!Become a TED Member today at ted.com/joinLearn more about TED Next at ted.com/futureyou Hosted on Acast. See acast.com/privacy for more information.
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