Wednesday, 17 June 2020

special relativity - How can time dilation be symmetric?


Suppose we have two twins travelling away from each other, each twin moving at some speed $v$:


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Twin $A$ observes twin $B$’s time to be dilated so his clock runs faster than twin $B$’s clock. But twin $B$ observes twin $A$’s time to be dilated so his clock runs faster than twin $A$’s clock. Each twin thinks their clock is running faster. How can this be? Isn’t this a paradox?




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