what is speed of light
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The speed of light in vacuum, commonly denoted c, is a universal physical constant ... The speed at which light waves propagate in vacuum is independent both of the motion of the wave source and of the
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Light travels at a constant speed of 1,079,252,848.8 (1.07 billion) km per hour. That works out to 299,792,458 m/s, or about 670,616,629 mph (miles per hour).
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