Humans May Be the Only Intelligent Life in the Universe, If Evolution Has Anything to Say | Live Science
Are we alone in the universe? It comes down to whether intelligence is a probable outcome of natural selection, or an improbable fluke. By definition, probable events occur frequently, improbable events occur rarely — or once. Our evolutionary history shows that many key adaptations — not just intelligence, but complex animals, complex cells, photosynthesis, and life itself — were unique, one-off events, and therefore highly improbable. Our evolution may have been like winning the lottery … only far less likely. The universe is astonishingly vast. The Milky Way has more than 100 billion stars, and there are over a trillion galaxies in the visible universe, the tiny fraction of the universe we can see. Even if habitable worlds are rare, their sheer number — there are as many planets as stars , maybe more — suggests lots of life is out there. So where is everyone? This is the Fermi paradox . The universe is large, and old, with time and room for intelligence to evolve, but there’s no