Aštra’el
Aštara, Blade of Aštoreth
It is mentioned in the very first sentence of the Bible, and again throughout the Bible.
If this world was created by God, than God is not of this world. Or, extraterrestrial. As in, not of this earth, and perhaps even not of this universe. So no, I don’t see why confirmation on the existence of extraterrestrial beings (considering the size of the universe, is pretty much guaranteed) would present any theological issues. I think instead you might find people going back and reinterpreting some of the language and descriptions in ancient religions of “divine beings” or “gods” who descended from our skies.