Hi Rallem.

There are a few distinctly different scientifically legitimate hypotheses regarding the 'multiverse' that aren't necessarily mutually exclusive. Wiki contains quite a good outline of these:

http://en.wikipedia.org/wiki/Multiverse

The only edge I can perceive within these hypotheses is that of the kind of boundary represented by the hypothetical wormhole, or by an event such as the Big Bang. Theorists seem generally convinced that our spacetime continuum is either infinite, and therefore boundless, or finite and unbounded, meaning that if you go 'straight' for long enough, you wind up back where you started. Currently, I think the situation is that there's no evidence for either.

"Time is what prevents everything from happening at once" - John Wheeler