True that we know little and actually this is my point. I fear that "of course there is life out there in the universe" (as much as I too would like to share in

True that we know little and actually this is my point. I fear that "of course there is life out there in the universe" (as much as I too would like to share in this sentiment) may be an anthropomorphic projection and wishful thinking. One thing we are able to estimate is the number of stars in the observable universe -- that collection of stars in causal contact with us. It is far from infinite. In fact, not that much larger than the number of atoms in a macroscopic chunk of matter. The number of possible games of chess is incomparably vaster. This is not to say that we should not look for traces of life. That is a completely separate question.