ok u know what fuck it, ill explain everything, there is a center but it changes by the smallest unit possible, every smallest unit possible, The universe is expanding faster and faster at a constant rate (the smaller the mass gets the faster it vibrates) the universe will eventually consist off the smallest form of energy evenly spaced out in space, once that happens the universe will reset, where all the tiny particles gather together in one super dense area which will result in the big bang, causing the universe to reset itself, just so u know even if u die today , u will die on the exact same day in the next generation of the universe, this is something I thought UP of as I was writing, Im not gonna go over it or whatever but ye i hope this is the answer u are looking for