Where are all the aliens? Stephen Webb

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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Where are all the aliens? Stephen Webb is an episode from TEDTalks علوم و طب by TED.

This episode is 00:13:08 long.

This episode was published on Jul 19, 2018.

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