Also, the expansion of the universe does NOT result in expansion within galaxies. Gravity wins over the general expansion of the universe; the outside stars do not get further away from the center over time.
Eventually, and it is a very very very very long eventually...expansion should win out over gravity. In combination with the death of stars, the continued cooling of space and the still accelerating expansion...the universe will eventually become completely 'flat', cold and dark. Entropy reaching its eventual conclusion where order is impossible when all is the same and non-reactive.
In my theories, it is in this flat uniform universe where you've returned to initial conditions prior to the big bang (3D space being irrelevant as all points are correlated, think solidified from the cold). It is in this highly uniform and stable state where quantum permutations are extremely slim in probability (cuz it so cold to the point where there is literally not one energetic warm particle left). Though, when that random quantum event does occur, the ripple is felt all throughout the universe with all energy rushing to the low pressure area of the event(The quantum event causes an uptick in energy increasing volume and lowering density). End state matter fills that energy gap until density is so great that another big bang occurs.
Just my wacky theory though...after years of studying quantum criticality at extremely low temps.