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Thread 'Alien life and probability'

It seems to me that if life started on earth exactly once in 4.5 billion years, then it is an extremely improbable event that is a very rare if not unique occurrence in the universe. I’m aware that the number of planets in the universe, including interstellar and intergalactic planets, is an absurdly high number. However, is it possible that abiogenesis is even more unlikely than the amount of places where it could occur? Could the answer to the Fermi paradox be that life is confined to earth?
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