metre is the distance travelled by light in vacuum during a time interval of 1/299792458 second. standard based on distance travelled by does not ensure (speed of light in vacuum is same for all the observers) .
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The speed of light may not be a constant, two upcoming studies find. In terms of astronomy and physics, the speed of light in the near perfect vacuum of space is pretty simple — 299,792,458 meters per second (or 186,282 miles p/s), generally
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