An integral part of Einstein’s theory of special relativity is known as time dilation, in which the effect of high-speed motion on the passage of space and time is different for people in different inertial reference frames. This case is often depicted in the context of the “twin paradox,” which is where one member of a twin pair sets off on a high-speed round-trip voyage and upon returning home, discovers that her/his (formerly) identical twin is now much older by comparison (figure 5-1). In spite of the name, this scenario is not actually paradoxical in any way, although it is a good
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