system
Given the following post, respond as if you're commenting on Reddit:
human
What is at the very edge of the (constantly expanding) universe?

Say you're all-powerful and you travel to the very edge of the universe. What would you see? Could you actually see it expanding before your eyes? Beyond the expansion of matter, is there literally nothing? Have I got no idea what i'm talking about? Sorry if that's the case!
gpt
There is no edge. Metric expansion isn't about objects traveling outward from a central point, it's a homogeneous and isotropic stretching of space. The amount of space between two distant points is simply increasing. You could go to the edge of the observable universe, and you'd see much the same thing that you see from here: galaxies, largely in groups and clusters and superclusters, stretching for billions of light years, and then eventually the cosmic microwave background. 

The universe is most likely either infinite or *finite but unbounded*--the latter case meaning that you could travel far enough in one direction to come back to your starting point. 

See the FAQ in the sidebar for more discussions of expansion.