Here is a *serious* question:
It has been established that *this* universe is not only open but its expansion is accelerating due to dark energy and will do so forever.
If the universe expands forever, all energy and mass itself will dissipate to a potential of zero.
If the universe on the other side of the Big Bang is a mirror image of our own, then it contracted from an infinite size and zero potential energy toward the Big Bang.
Since this universe does have potential and kinetic energy and is without resort to an oscillating model, how is this origin of it less ex nihilo in an infinite past than a Big Bang from nothing at a particular instant?
Yes, but I don't have an answer.