Eventually we may get a better idea of what may be beyond our universe. There seems to be no reason why if "space" is infinite.. there may be other "universes" scattered across infinity. A "universe" as we think we know it.. is really an "event" - so it has a beginning, an end and then "time" is the place where the action is. So, how many "universes" are occurring at this "moment" in time.. so to speak..? We don't know.. yet. Maybe never will know. It is fun to speculate though, make.. ha-ha.. "educated" guesses..
You may enjoy this site:
Stephen Hawking's Universe
Here is another little bit of cheer..
BBC NEWS | Science/Nature | Universe is 'doomed to collapse'