There is an article out today on the number of possible “Earths” in the Milky Way. The number may be low or high, depending on your point of view.
One idea that has occurred to me from a theological standpoint is that our propensity to idolatry and the worship of everything from bugs to the Sun make it highly unlikely that there is other human-type life in the Universe. I wouldn’t extrapolate to plant and animal life, but it seems to me that if we encountered another sentient species in our present state of maturity, we would probably fall to worshiping them at some point. Just a thought.