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The special theory of relativity describes the motion and dynamics of objects moving at significant fractions of the speed of light.
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The speed of light/EM waves in vacuum; as if there was another one in non-vacuum?
Q1: is there a speed of a photon other than in "vacuum"?
Q2: isn't "speed of light in vacuum" misleading?
If I understand, that light moves with speed of light until there is "something in between" …