It is possible for observers moving relative to one another to disagree on the order of two events. However, the theory of special relativity preserves cause and effect. If one event caused, or could have caused, the other, then the order of the two events must be preserved for all observers. Two light sources, A and B, are located 186,000 miles apart (the distance light travels in 1 second). An observer at the midpoint between the sources receives a light signal from source A 1/2 second before receiving a signal from source B. Is it possible that the light from source A caused source B to flash? Could another observer have seen B flash before A?
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