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If nothing is there then how can you say something exists?
Because the universe is expanding. If it were finite it wouldn't be able to expand. Emptiness is still "something". If we were "at the edge of the universe", we could still go further from the center, there would just be nothing for as far as we can perceive, maybe even infinitely, but then, we would be there. That makes it "a place".
If it's nothing, how can it be something?
It's potential. Matter can go there. Saying there is an end to the universe means that at some point, there is no possible expansion. It also means we are completely ignoring the tiniest infinitly small chance that our big bang wasn't the only one. If you zoom out far enough, is there really zero chance that this "known universe" is actually just part of a greater whole?
imagining the universe as a contained thing with hard limits is what gives me the creep