I know that God has the full capability to create other universes. I think in one of the Psalms that it mentions something about God knowing all galaxies, or something like that. I remember reading it, or maybe it was that he sees what happens in all galaxies, or wait. I think it was that he is a God of wonders beyond our galaxy. I think that is it. I will look for it.
But about life on other planets, I dunno. I don't believe in "aliens", like the ones everyone describes or beings that look mutilated(sp.??) or horrible, but I am not imniscient(all-knowing). God could have created other worlds, other beings(such as Fauns, Dryads, dwarf's, and such---maybe that is why people started believing in them--), but why would he send His son to another world to die again? That would probably be my only problem and that is that Jesus would have to go and die on another planet.
But who knows. When I get to heaven, I will ask or might possible not need to as in "Aslan's country" all worlds are there, but in a more grand of way.