the whole purpose of the universe is to encompass every possibilty that can happen. Thats why its so big and with the addition of time it becomes even more complex, if everything is moving then i would assume that the universe is simiar to a galaxy as in its rotating and this is what creates time as we know it also gravity (if you know anything about the zero point theory then you should understand perfectly why we have gravity). Well the end is when the universe comes full circle and returns to its point of origin, this is because everything that ever will happen has happened, whether it starts over or whether something new begins is still a mystery and one that we as a species will never know, our role is to exist without a higher purpose, unfortunatly we will be a little to self motivated when we finally travel out into the unexplored universe, that will lead to our extinction.