The conventional method for measuring speed does not work with light. So physicists have relied on mirrors to measure the speed of light on a two way journey using a mirror. Which leaves open the possibility that light could move faster in...See moreThe conventional method for measuring speed does not work with light. So physicists have relied on mirrors to measure the speed of light on a two way journey using a mirror. Which leaves open the possibility that light could move faster in one direction than the opposite direction. Written by
David Foss
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