[Hot Tabasco]

You are correct [as far as we know] that there is a barrier that keeps us from going "outside."

I appreciate the answer but I'm still unclear about the "barrier".

Are you saying that the "barrier" that would prevent us from viewing or knowing what lies beyond the edge of the universe is "time" in the sense that we would never have enough time in which to actually travel to that edge?

Or is there another explanation that I can't seem to grasp?

[FredZarguna]

What is “outside” is the future. What is “inside” is the past. We are expanding into the former. We are forbidden by Entropy from travelling into the latter.