If Space is a vacuum with nothing in it, then what would the edge of the universe even mean

Question

…it would be a ‘border’ between nothing and nothing?

In: Planetary Science

Answer 1

Each universe is like a bubble so the edge of a universe is the edge of the bubble, with the spaces between universes being made up of pairs of positive and negative gravity particles locked together and rotating in a single spot non stop.

So such walls are what the multiverse was initially like but some spaces just started to have such gravity pairs breaking apart and collecting more and more gravity pairs until an indescribably huge empty space is formed and the gravity collection’s mass becomes so dense that the big bang occurs.

So other universes may have the charges of protons and electrons reversed since which charge they end up having is totally random thus people from one universe cannot go to another.