When you take into account an infinite number of stars and the recent revelation there are an equally infinite number of earth like planets and couple that with the passage of billions of years, how can there not be alien life somewhere, sometime. This does not even take in to account the possibility of a multiverse which postulates an infinite number of alternative realities. The likelihood of intelligence developing and a species surviving its " formative " years ( the propensity to want to kill all members of the species who are different in some respect ) and then developing the technical capability to travel the stars seems to be a very remote probability. Humans would still be in but the " infancy " stage in that respect. All species also presumably come to an end. Considering the vastness of the universe and the passage of time alien life might once have existed, might exist, or will exist that will know of our little planet but the probability they will ever interact with our civilization I believe is infinitesimal. With all of that said, they will no doubt be landing tomorrow at 3:00 PM EST.
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