I'm not sure if this is a question for philosophers or for physicists, but I'll ask it here anyway. Do you think it is possible that there are other universes? I mean "other universe" in a very physical sense: any group of objects that have no past, present or future physical relations to the objects in our universe. For example, they don't originate in the Big Bang. And it is physically impossible that a photon leaves one of such objects and hits one of the objects in our universe. And those objects aren't at any distance from the objects in our universe (it cannot be said truthfully that those objects are or were n light-years away from any star in our universe). But I mean real, actual objects, and not merely "possible objects" (there is a previous answer on this subject in AskPhilosophers, but that's not what interests me)! Do you think that there can exist other universes in this sense?