The Big Bang is not the beginning of our universe — it’s actually the end of something else entirely
That's easy. There was another universe which expanded, entropy acted, all mass, and energy fell to its lowest state, and there was no longer any interaction. From quantum theory we know that in this state, everything would become nothing more than a probability. A universe comprised of nothing but probabilities cannot inflate the fabric of space time, which would collapse into a single one dimensional point. As probabilities, the "things in the universe" could exist within the one dimensional point without interaction, or observation of one another.
However, once someone, or something did observe into the one dimensional point, and did observer any of the probabilities, it would instantly spring into reality. By doing so it would "observe" every single thing/probability within the universe instantly. This would cause all of the probabilities to spring into existence instantly, all while trying to occupy the zero point space of the one dimensional point.
The Big Bang.
All the matter, and energy within our universe attempting to occupy a zero point space would create a bang of near infinite size, better stand back.
It would also instantly begin the expansion of space/time. Add a few billion years, and viola, her we are, add some billions more and we are near the end, with entropy near completion, with nearly everything approaching probability status, with space/time only tenuously being inflated.
Then the probability phase occurs, space/time collapses, and the universe reattains zero point status, existing within a one dimensional point. Until again, God, or whatever you wish to call the observer, peers into the one dimensional point, observes any single "thing," and causes . . .
. . . a Big Bang.
Lather, rinse, repeat.
Is it possible, the task God has set for humans is to be come the next observer? Or is that taking my ego to far?
Interesting? Start reading here:
Quantum Enigma, by Rosenblum, and Kuttner