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Q: According to relativity, two moving observers always see the other moving through time slower. Isn’t that a contradiction? Doesn’t one have to be faster?
That is to say, they both see the other person moving through time slower (you will always see your own clock running normally, in all circumstances). You may both observe the other person’s clock running slower, but that’s not a contradiction in any “physical sense”. So, Alice was right about Bob seeing the front bolt first, and the back bolt second. The tracks may be bigger, but (as Dr. V. E. Kilmer discovered experimentally) there’s no physical way to say who’s moving and who’s not. This puts Alice and Bob on equal footing, and there’s no questions about “who’s right” or “who’s moving”.
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