Even though the scientific probability of other intelligent life in the universe appears to be high, I rather doubt it. To me, the likelihood that everything necessary to duplicate the circumstances needed for life on earth to form intelligent lifeforms, is remote. Not only did earth have too be not to far from her sun and not too close, but earth needed the giant gas planets at just the right places in the solar system to protect her from destruction.
Yes, there are trillions of stars, but how many are in just the right place on the out-skirts of it's galaxy, like our own, to prevent all the nasty things that can happen close to the center of a galaxy from destroying it's planets?
I think I would be happy to be wrong, but even if I'm wrong, I'm not sure I really would be happy to know that there were a higher intelligent alien civilization knocking on our door. It didn't go too well for the Native Americans.
Just saying...