There is no border, it's a loop.
Yes, the universe is expanding, but not out into anything.
Imagine that you blow a balloon up, that is basically what has happened since big bang. The whole "being" of the universe is on the surface/fabric of the balloon.
WE are on the surface / fabric of this balloon, thus our furthest point is the place of origin.
GAH!!
I neither have the English nor brain to explain or grasp all this. I do however do my best to try to explain it to people as stupid as I from the very limited knowledge that I have.
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