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We could talk about the relative observations of observers and go around and around about what they would observe in a "faster than light" system, but in an objective frame of reference, nothing happens before it happens.
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Wasn't the whole point of relativity to state that there are no absolute frames of reference, only relative ones?
I've got a better question than the barn door:
A guy is in a vehicle heading towards me at some fraction of light speed.
The guy in the vehicle emits two light waves, one heading forward and the other heading backwards along his flight path.
From his perspective, since light will always travel at c relative to his speed, he will always be in the exact middle of the two beams.
To me, because he is moving, he will always be closer to the lightwave he sent forward along his path.
Seeing me ahead, he decellerates his ship and comes to a stop (relative to me). Now we are both in the same frame of reference, side-by-side and at the same speed.
The trouble is, he must still be in the middle of the two waves from his perspective. He cannot be in the middle of the two waves (must be closer to the "front" one) from my perspective, but we are in the same frame so we must have the same perspective now (which we cannot do).
Anyone got a solution for that?