Einstein’s missed opportunity to rid us of ‘spooky actions at a distance’

Why do moving rulers shrink (length contraction) and moving clocks run slow (time dilation) such that everyone measures the same speed of light c, regardless of their relative motions? Einstein resolved this mystery at the turn of the 20th century in “principle fashion” by turning the question on its head. He invoked the relativity principle (AKA “no preferred reference frame”) and argued that since c appears in the equations of physics, no preferred reference frame says that everyone must measure the same value for c regardless of their motions relative to the source (that is, regardless of their reference frames).

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