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Where did the matter/energy for Big Bang come from? On that note, what is outside the border of the universe?
The Universe is expanding, rapidly from the big bang still. At some point, it will slow down, and then stop. Then begins a catastrophic cycle of collapse with massive black holes coalescing into one universe eating black hole that compresses every bit of matter into a single point of almost infinite density. At this point the black hole destabilizes, and all of the stored energy is released in one colossal explosion. A Big Bang of sorts.
The Universe is an Ouroboros.
Somehow I find the Big Crunch more comforting than Big Rip...