sorry for gravedigging here, but i think my answer is helpful.
You know how when you go around the globe, you get back to where you started? That's because you're moving in two dimensions. But when people started to think in the 3rd dimension (depth), then they knew how to get into the sky. What we need to do is think of a fourth dimension, like a z chart on a graph- every one of the three axes is perpendicular because it works in three dimensions. What I am saying is that the 4th dimension (time) will be our passage out of this plane, or universe. The problem is that, like figuring out how to get off Earth, it was a while before we actually executed. We need a time machine.
And the big bang theory states that eventually the universe will come back together, and then expand again; those repeating universes ("parallel dimensions") are the alternate realities; perhaps there is even a Bigger Bang which resets everything; there is no gravity, and the most absic shape for the new humans is the tesseract (hypercube), and they take as long as we did to get off the earth to discover time. Who knows?