Quote:
Originally Posted by OutOfTheCube
The pessimistic values for 'Fraction of earth-like planets that evolve life' and 'Length of time a civilization communicates' are crazy low, too. We can assume that if a planet is earth-like, it is HIGHLY likely that it will evolve some kind of life, even if it's just some single celled organisms or something.
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Why would you assume this? As far as I know, nobody actually knows how "life" initially formed out of whatever chemical soup was on Earth billions of years ago. I would bias my thinking the other way, and say that maybe it's really, really unlikely for life to form in the first place, but if it does form on an Earth-like world then there's a good chance it'll eventually evolve some higher intelligence.