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The first thing to realize is that there is no such thing as "being in motion". Unless you are accelerating there exists an inertial frame in which you are at rest. You cannot objectively say something is moving without specifying what it is moving relative to. This is not something peculiar to relativity, it is true also in classical mechanics.Jakecp said:ok but taking in account that observation , that if you are in motion things go faster. Light is faster than what we measure?