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

Space is not just a vacuum with nothing in it. Space itself exhibits fundamental properties like the fact that it expands, it houses quantum fluctuations we call virtual particles, and it is the stage on which quantum fields like the higgs field and the electromagnetic field exist. The universe itself IS the space and everything it contains. Outside of that, we have no idea, and probably won’t know either since matter expands with space, but it cannot move faster than space (since space expands at speeds much faster than light).