Bible2,
Some judge the concept as "absurd" or "imaginative". Some say "aliens are angels". Even others have decided that if it's not in the Bible then it doesn't exist (then again, I'm not specifically mentioned in the Bible).
Me, I have no idea one way or another. God is certainly capable in my opinion. As curiosity is often a double-edged sword, I try to focus that trait towards things that I CAN know, but don't.