[Joe Hadenuf]

You may be right. But I am sure you are wrong.

[Exnihilo]

You may be right. But I am sure you are wrong.

Why? I take the approach to extraterrestrial life that atheists take to God. There is no evidence for God, so there is no reason to believe in God. God is possible, and so is extraterrestrial life. At best you should be agnostic with respect to extra-terrestrial life. I still fail to see how one can make any assertions about the probability of life on other planets without some knowledge about the probability of life on other planets, which is a tautology.