Perhaps. . . .

Some twelve to fifteen billion years ago (depending on varying estimates—and reckoning by the way we measure time), a cataclysmic event took place. But this was in some other universe. A giant star finally burned out, went supernova, and imploded into a black hole. At that instant, SUT (Super-Universal Time), what we call "the Big Bang" occurred, and our universe burst into existence.   

In our universe, from time to time, a giant star goes supernova and implodes into a black hole. And another universe—within our universe—is created. To that universe within our universe, the Big Bang has just taken place.

Lest someone quibble over the word "universe," and point out that there can only be one universe (by definition), let me clarify that what I am postulating is that we are seeing only our particular portion thereof, and that much more exists than we can perceive. Remember, at one time, cosmologists thought that the Milky Way galaxy was the universe and there was nothing beyond it. And before that, there was the sun-centered universe. And before that, there was the earth-centered universe.

What I am postulating is the possibility that there is an infinite number of what we call "the universe." Each "universe' is nested within another "universe"—like Russian Matryoshka dolls. You know the ones:    you open up one doll and there is a smaller, but otherwise identical doll inside. You open that one, and there is another doll inside that. And so on.

Our universe is within an infinite number of universes beyond ours. And there is an infinite number of universes within ours.

Perhaps. . . .

Don Firth