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Prepare yourself

Our universe exists. What is outside our universe?
If we can assume the multiverse theory is valid then there is a space filled with many universes called the multiverse.
But what's outside of the multiverse?
What's outside that?
There can't be "nothing" because "nothing" doesn't exist, yet we sare something in a sea of nothing.
How did something come from nothing.
we can argue about how the universe started, but the real question is "how does existence exist?"