I have heard that everything in our physical reality is relative. But I wonder:
- Does the universe have an edge? In an expanding sphere, there would be an edge is it like that?
- If the above is true then isn't everything relative to the edge. And not relative to eachother? Also, the speed of an object could be measured not as its speed moving away from an object but rather its speed moving away from the edge when it started or at all times (there would be a cancelation and I guess that would mean it could even be a - speed)
