…it would be a ‘border’ between nothing and nothing?
In: Planetary Science
So there’s quite a lot to unpack with your question.
First when someone says edge, it’s usually or should be followed by “observable universe”. This is the edge at which light has been able to travel to reach us. So from our point of view, the furthest it’s possible to “look” and see something.
Space being a vacuum is another loaded piece of your question. A vacuum is measured in how little stuff there is to cause pressure. This doesn’t mean there’s no stuff. But just that it’s very spread out. On earth at sea level we will have 1 atmosphere. In space it’s something like 1×10^-20 atmospheres depending where you are. There will still be stuff and in star systems there’s more stuff than the space between galaxies.
Space is not the same thing as the universe. Space is just… the space between the stuff that’s in the universe and there is a lot of space in the universe.
Finally there’s the “border” part. If you were inside a donut (or torus) you could keep travelling around and around without coming to an edge. Now you might say that the donut has an outside. If you take the concept of this donut or edgeless shape into 4 dimensions, then there’s no edge as defined by the 3 coordinates of x,y and z. Outside our universe will be a different dimension that we couldn’t see and so the universe (not to be confused with the observable universe) is infinite in all directions.
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