…it would be a ‘border’ between nothing and nothing?
In: Planetary Science
You sort of got why “edge of the universe” doesn’t make sense if you define the universe as “everything there is.” As far as we know, the universe is flat, so it just goes on to infinity with no edge. It’s also possible for the universe to be slightly curved so that it’s closed, but that doesn’t give it an edge either since traveling in a straight line just eventually leads back to where you started.
Since all interactions are limited by the speed of light, we can talk about the _observable_ universe (i.e. the region of space around us with which we theoretically could have interacted with) but even that doesn’t have a real edge, and it’s constantly expanding anyway as older and older light catches up to us.
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