Be careful. Some day, they might find life on another planet. If people of faith have made a big stink about how the lack of ET life supports our special place in the Lord's heart, there will be a conclusion drawn on the part of many - well, now's there's some ET life, faith must be wrong. This is similar to why YEC views are dangerous - if it's either Creationism/God or Evolution/atheism, this pushes science-minded people away from faith for no real reason.
I know what you are saying, but science tries to push any discovery as anti-religion. They will find a little bacteria on Saturn and use it as proof religion is bunk. I just hate to see tax money wasted on this.
Why? Nowhere in the Bible did I see it written that we were God's only planet full of creatures, just that He is the only God.