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RE: We've Not Been Alone In The Universe
Simple argument. The law of large numbers...
Since we exist, a probability for life exists. If the universe is infinite, then life has to occur an infinite amount of times.
This is a good point - indeed the probability of anything over an infinite time interval would be 1. However, the universe might not be infinite and Frank & Sullivan only assumed the probability over the observable universe, ~47 billion lightyears, a very large number! Yet, still infinitely far from infinity.