Comment Re:FSVO "about" (Score 4, Informative) 171
The only hard and fast rule is that space-time is divided into 3 zones:
* The absolute past - events within (or on the surface of) the light-cone leading up to here-and-now
* The absolute future - events within (or on the surface of) the light-cone starting at here-and-now
* Everything else - events in neither light cone, which means they cannot affect us and we cannot affect them. Depending on an observer's motion relative to us and such an event, someone might see the event as happening at the same time as the here-and-now, or before, or after. It doesn't matter, because such an event is not causally connected to the here-and-now in either direction.
The interesting thing is that the vast majority of the universe is in the "everything else" zone.... contemplate that one for a while...