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Sexta-feira, 18.10.19


(Nick Longrich/





  • Are We Alone in The Universe?


“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 evidence of it.” (Nick Longrich)


  • Could Intelligence Simply Be Unlikely to Evolve?


“Unfortunately, we can’t study extraterrestrial life to answer this question. But we can study some 4.5 billion years of Earth’s history, looking at where evolution repeats itself, or doesn’t.”

“Humans couldn’t evolve until fish evolved bones that let them crawl onto land. Bones couldn’t evolve until complex animals appeared. Complex animals needed complex cells, and complex cells needed oxygen, made by photosynthesis. None of this happens without the evolution of life, a singular event among singular events. All organisms come from a single ancestor; as far as we can tell, life only happened once.” (Nick Longrich)


  • Curiously, All This Takes A Surprisingly Long Time.


“Photosynthesis evolved 1.5 billion years after the Earth’s formation, complex cells after 2.7 billion years, complex animals after 4 billion years, and human intelligence 4.5 billion years after the Earth formed. That these innovations are so useful but took so long to evolve implies that they’re exceedingly improbable.” (Nick Longrich)





  • An Unlikely Series of Events.


“These one-off innovations, critical flukes, may create a chain of evolutionary bottlenecks or filters. If so, our evolution wasn’t like winning the lottery. It was like winning the lottery again, and again, and again. On other worlds, these critical adaptations might have evolved too late for intelligence to emerge before their suns went nova, or not at all. Imagine that intelligence depends on a chain of seven unlikely innovations – the origin of life, photosynthesis, complex cells, sex, complex animals, skeletons and intelligence itself – each with a 10% chance of evolving. The odds of evolving intelligence become one in 10 million … (or) intelligence will evolve on just 1 in 100 trillion habitable worlds. (Nick Longrich)


  • And Yet, We’re Here.


“If evolution gets lucky one in 100 trillion times, what are the odds we happen to be on a planet where it happened? Actually, the odds of being on that improbable world are 100%, because we couldn’t have this conversation on a world where photosynthesis, complex cells, or animals didn’t evolve. That’s the anthropic principle: Earth’s history must have allowed intelligent life to evolve, or we wouldn’t be here to ponder it.” (Nick Longrich)


  • Earth’s History … (and) … Intelligent Life to Evolve.


“Intelligence seems to depend on a chain of improbable events. But given the vast number of planets, then like an infinite number of monkeys pounding on an infinite number of typewriters to write Hamlet, it’s bound to evolve somewhere. The improbable result was us.” (Nick Longrich)


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(imagens e texto/extractos: Nick Longrich/Evolution tells us we might be the only intelligent life in the universe/October 18, 2019/

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publicado por Produções Anormais - Albufeira às 23:06