Quote:
Originally Posted by bill_mchale
Huh? That is what the Drake equation is trying to figure out. Ok, technically civilizations, and they have to be capable of sending us (intentionally or not) a signal we can detect, but it factors in the life time of the average civilization (obviously a guess for alien civilizations) to figure out how many we might expect at any given time.
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How long a civilization lives is not analogous to
when it lives. Two civilizations can be a million years old, but if they came and passed a few
billion years apart, they will never meet. The Drake equation doesn't address that.