One of the fundamental postulates of the special theory of relativity is that the speed of light is uniform in all directions, and is independent of the motion of the emitter or the observer. A recent report from the Joint Institute for Laboratory Astrophysics (National Bureau of Standards and the University of Colorado) in Boulder has greatly increased the precision with which we know that the postulate agrees with experiment.

Topics
Fundamental constants, Special relativity, Astrophysics
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© 1979 American Institute of Physics.
1979
American Institute of Physics
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