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

>If Space is a vacuum with nothing in it,

This is a misunderstanding of what space is. To be fair even the physicists don’t know what space is so it’s understandable.

But, space is a thing. It’s mostly vacuum as you mentioned but there is still a lot going on in there.

It can be bent by gravity for one thing. If it was nothing, there would be nothing to bend. So space is something that can be bent.

Space is made up of forces too. Weak, Strong, the electromechanical, and gravitational forces. Again nobody is sure exactly what those are but they make up space.

And there is a lot of other stuff going on when you get below the traditional things you can see and touch and feel.

So, space is something, the edge of the universe might be where that something isn’t there anymore. But again, nobody knows.