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I agree with the first response ... the empirical evidence that this universe can harbor life is us. One of the problems we're going to run into is time. What if Earth was the first planet to spawn life? What if some planet a million light years away is at the stage that earth was at a million years ago (or even as we were 250 years ago)? Lots of life, but none of it is trying to find us, and we have no way of detecting it.
and therefore have no way of knowing that it even exists. What if the Earth is the first planet to spawn life? What if it's the last and the only? What if life is nothing but chemical reactions and electrical impulses? That's the reality of a world in which only that which can be proven empirically is true.