what is the speed of light in air or vacuum ?
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Speed of light in vacuum is exactly 299,792,458m/s.
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But some scientists are exploring the possibility that this cosmic speed limit changes. The speed of light in a vacuum is 186,282 miles per second (299,792 kilometers per second), and in theory nothing can travel faster than light. In miles per hour, light speed is, well, a lot: about 670,616,629 mph.
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