i think it expands at the speed of light so to go beond the boundaries of it is impossible unless you go faster than the speed off light which is impossible, so far...
accutally the expanding part is all the other things so the "universe" expands and is endless
i mean :right of univers. in the end of the comment
and it says when you cames to univers end like right of univers you will be on left of univers same as you is at left of univers
if you know how everything was creat then you know everything thats true
Or it might be relative: for us the universe is unendless, butt in fact it's just very, very, very huge. But, yeah, i think it are those theories are non related to each other, sorry.
From what I know, the universe being infinite and the universe still expanding are two different theories that aren't connected. I might be wrong though.