3 ms·
> Here's the rub though: from Bob's perspective, Alex is in his past This is not possible, if B is in the past lightcone of A. The relative time ordering can o
by ssivark 6y ago
> Here's the rub though: from Bob's perspective, Alex is in his past
This is not possible, if B is in the past lightcone of A. The relative time ordering can only vary if the two observers/events are spacelike separated — in which case the each have access to events the other doesn’t.
- jiggawatts 6y agoEveryone thinks everyone else is in their past. Colloquially, we think that Alex and Bob are the same persons from each others' perspective. Physically, this is not true. They're different. There's Alex and Bob-in-Alex's past, and also Bob and Alex-in-Bob's past. Four "people". If helps, use symbols: A(A), A(B), B(B), B(A).