I don't see how any of my argument is "circular reasoning" :/Originally Posted by Sci_Girl
I'm not claiming that there isn't other life out there, only that we cannot know whether or not there is other life out there (unless we find some, of course) because there are a lot of variables in e.g. the Drake Equation or the Rare Earth Equation (etc) that we do not know. Their values could range wildly and it's all speculation. The fact of the matter is that there is only a probability of other life being out there, if life indeed generated spontaneously (if there was a free-willed "creator" then all of our efforts to estimate are moot). That probability could be 99.9999%. It could also be 0.00001%. Or anywhere in between or even more extreme.
