HOW WIDE IS THE UNIVERSE?

Nobody really knows, but here are some interesting facts that may give you an idea of just how tiny everything we can see from Earth is:

The observable universe, which is the portion we can see from Earth, and from which we could never escape, because the universe is expanding faster than the speed of light, is about 92 billion light-years across, that is, about 5.40833534333e+23 miles across.

Stars and galaxies reach all the way to the edge of the observable universe without diminishing, and space-time geometry in the observable universe is very flat, meaning that the universe as a whole is either infinite, and always has been, or is gigantic compared to the observable universe.

If you could exceed the speed of light, so that you could reach and pass through the edge of the observable universe, you would find more cosmos there, with more galaxies, and if you traveled far enough, you would no longer see our observable universe, but rather a different one. The edge of the observable universe is not a physical thing, it is just the furthest we can see.