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Tired light is the hypothesis that light slowly loses energy as it travels through space. Since a decrease in energy corresponds to an increase in wavelength, this effect would produce a redshift in spectral lines that increases with the distance of the source. It was originally postulated in 1929 by Fritz Zwicky as an alternative to the standard interpretation that the redshift is caused by expansion of the universe. Most physicists and astronomers do not believe that such an effect can account for cosmological redshifts.
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