Since the outer boundry(s) of our expanding universe are moving at a less than the speed of light rate there must be light waves generated in our universe that travel to the limits of our expanding universe and reach the "edge" of it. What takes place when they reach this edge? Can they "bust through" to the unknown outside of our universe or are they stopped dead or reflected back into our universe, or whatever? Something must happen to them and I don't think that they can go beyond the edge of our universe. If this question is not clear enough I am glad to try to explain it further.