Our ‘present’ does not extend throughout the universe. It is like a bubble around us. How far does this bubble extend? It depends on the precision with which we determine time. If by nanoseconds, the present is defined only over a few metres; if by milliseconds, it is defined over thousands of kilometres. As humans, we distinguish tenths of a second only with great difficulty; we can easily consider our entire planet to be like a single bubble where we can speak of the present as if it were an instant shared by us all. This is as far as we can go.
Present
