I propose the universe exists in itself. That the interstellar space - is the same as subatomic space. Its both at the same time, like a möbius strip. Space between stars is space between atoms, etc.
This is my favorite hypothesis, even though/especially because it makes your mind spin. I could be wrong but I think Roger Penrose has some thoughts along these lines. I may be butchering this and/or injecting my own (admittedly ignorant) pontification into it, but:
The universe will keep expanding until entropy reaches a maximum -- the "Big Freeze." Once maximum entropy is reached -- wherein all atoms in the universe are totally dispersed, everything is the same distance from everything else, and the universe is a totally uniform field -- one could say that is very orderly indeed, i.e. the theoretical minimum entropy.
I imagine that all of the matter in the universe being perfectly dispersed would quite neatly "fill" the universe. So who's to say such a situation isn't infinitely dense?
