What will (most) Christians say if we discover a form of life that is more advanced? What if they have a religion of their own that is completely different than the Judeo-Christian belief? Will Christians just say that God has a good sense of humor?

On a different note, we all know that Milky Way has billions of starts - something like 100-400 billion stars. This should be no surprise. But what they don't tell you is that each of these stars are basically like our sun. For all we know, these stars might have an average of 10+ planets and dwarf planets, much like our own planetary system. These exoplanets also might have multiple moons,  much like the 63 moons revolving around Jupiter.

So when you hear that our galaxy has a lower limit of 100 billion stars, that's 100 billion suns, and we haven't even begun to estimate the planets and the moons yet. And Milky Way is just one of hundreds of billions of galaxies in this world. Not to mention that we don't really know how big the universe is, because the light from the furthest places have not reached us yet.