The universe has no edge. It's expanding but there's, say, no center of the universe. It's a hard concept to grasp for some, I couldn't understand it for quite a while.
For an example, you guys know that 2-dimensional representation of space-time? That trampoline thing? Well, suggest that surface is the SURFACE of a balloon, not the composition of the volume of the balloon. Now, draw dots on the surface of the balloon. Blow the balloon, and watch the dots spread apart as the universe expands, but has no center. The surface of a balloon has no center. The balloon in its volume might, but not its surface.