Where are all the aliens? – Astronomer Stephen Webb has an explanation: we’re alone in the universe, making us a lot luckier than we think!
The universe is incredibly old, astoundingly vast and populated by trillions of planets, so where are all the aliens? In a mind-expanding talk, Stephen Webb 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.
