Xsjadoblayde said:
Seeing as all the questions have been taken, Do I have to answer a question before I can ask my own? Wait...no that isn't my question!
Mine is;
Q. If we ever reach the edge of the universe and try to pass through it, will a giant hand gently nudge us the other way and tell us it's not safe for humans yet?
The short answer is that you can't, even in principle, reach even a theoretical edge of the universe. You could, if you could accelerate VERY quickly, come close to the Cosmological Event Horizon.
The long answer is that there is no evidence that the universe has an edge. It may well be that the geometry of spacetime does not support something like an edge, and that an attempt to reach an edge would be like an ant on a rubber ball trying to find an "edge". It would not be a meaningful search, from the ant's perspective.
It is also possible that the universe is infinite in extent, or that it DOES have clearly defined edges. The former isn't interesting for this question, but the second IS. You may hear a lot about "the edge of the universe" in pop science, but what you're probably hearing is, "The edge of The OBSERVABLE Universe". That's not a function of the quality of our instruments however, as many assume.
The observable universe (TOU) is defined by a combination of factors: The speed of light in a vacuum (c) and galactic recession velocity (GRV). That last one... remember that the universe is constantly expanding, right? Well, that means that SPACE is expanding, there is MORE and MORE of it at all points. That includes the space between galaxies. Now, light can't exceed 'c' in its own frame of reference (like a sprinter who can't run faster than 18mph), BUT if that frame is ALSO accelerating (the sprinter is on a platform on a moving train) then it can exceed 'c'.
What that means, is that beyond a certain point (the Cosmological Event Horizon) determined by your present position in the universe, you can NEVER observe it... never reach it. The light from beyond that point will never reach you, even if you could travel at 'c' to meet it. SOMEONE would need to exceed 'c' to meet.
So... maybe there is an edge? Maybe not? Unless 'c' isn't a limit after all, it's not really a human concern.
TL;DR No, we can't, but not because of any special intervention (literally or figuratively)