I don't like the multi-verse theory. I like to think that this universe is the only one. Keeps things simpler. On the other hand, there are aspects of the behavior of sub-atomic whatsits (like photons) that don't really make sense. Then there was Plato's (or Aristotle, one of those old Greek dudes) who speculated that the world we experience is only a projection from the real world, something like a shadow on the wall of cave cast by firelight is only a projection of the hand that is casting the shadow.
So I'm thinking that our brains have evolved a sort of imposed order on the primordial soup of sub-atomic whatsits and what we see and experience is what we collectively imagine. If all the people vanished, the universe wouldn't vanish, just our cosmology would. Animals still perceive our world, but (as far as we know), they aren't concerned about the heavens, or sub-atomics whatsits.
We haven't been able to come up with a way to travel to other stars, but given our wild imaginations, I expect that someday we will. And it will be because someone discovers (or imagines) a here-to-for-undiscovered principle.
Right now Obayashi is predicting that we will build a space elevator by the middle of this century. At least they forecast the travel time to orbit will be about a week. First time I've heard a reasonable estimate for that. A week! Ain't nobody got time for that! Gimme a rocket!