[Oatka]

The phrase “Defeats the imagination” comes to mind here. I cannot comprehend what the end of the universe looks like.

One wag said that it probably was a large fence with the words “Under Construction” posted on it.

[chajin]

One wag said that it probably was a large fence with the words “Under ConstructionTemporary Inconvenience, Permanent Improvement” posted on it.At least that's what the signs said when I was a kid

[Tijeras_Slim]

I cannot comprehend what the end of the universe looks like.

[BitWielder1]

Don't confuse the size of the universe with the size of the observable universe.
There is no actual edge, we just can't see any further than that. Yet.
Similar to the horizon on earth, you can't see the sea further away but if you go there (and on earth it's possible) it does not look much different than where you were.
If you managed to travel in an instant to what you think is the end of the universe, you will find billions of years have passed at the spot you observed, expansion has taken place and the overall view of the universe from there will be pretty much the same as from home.
The Universe has no center. Earth is only where our viewpoint is. It's not special.

[GreenHornet]

The phrase “Defeats the imagination” comes to mind here. I cannot comprehend what the end of the universe looks like.

This stuff always makes my head hurt. What is just beyond the edge of the universe?