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The point is that the theory of relativity says that there is no unique measure of time that all observers will agree on Rather, each observer has his or her own measure of time. If it is possible for a rocket traveling below the speed of light to get from event A (say, the final of the 100-meter race of the Olympic Games in 202) to event B (say, the opening of the 100,004th meeting of the Congress of Alpha Centauri), then all observers will agree that event A happened before event B according to their times.
— A Brief History of Time
 (book)
by Stephen Hawking
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