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this post was submitted on 24 Jun 2024
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What I meant by "what if it wasn't the first big bang?", was that what if it wasn't the first of our own universe? I mean what if space will at some point stop expanding and start contracting. Pull everything back close together again. Then theres another expansion just like what we're currently in now. The best scientists, physicists, and mathematicians haven't been able to work out a lot of major thing about our universe or how it works or even if it's flat or folded in on itself yet. The data and tests/measurements don't exist yet. So until that can get worked out into a theory, it's silly to say time began at the expansion.
Last I heard scientists were leaning more toward the ever-accelerating expansion "heat death" theory then the expansion-to-contraction "big crunch" theory, but it's not set in stone yet. But even if "big crunch" came out on top, assuming that the life of the universe is cyclical is pure conjecture. It could be right, but it's unprovable, so we'll never know.
As for the existence of space-time before the big bang, I don't know what to tell you, I'm just quoting theory. By definition, the big bang is when space-time came to be. If the big bang was the result of an ancestor universe's big crunch, we can't assume that the same space-time carried over, let alone that the ancestor universe even had something analogous to space-time. Barring some insanely massive breakthrough, it's simply unknowable.