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The Ageing of Light

Abstract

RED-SHIFTS in the spectra of the galaxies are usually interpreted as Doppler effects consequent on recession. Alternatively, they have been interpreted as an 'ageing' of light with time, by which the wavelength of a photon steadily increases. That the two interpretations are substantially equivalent can be seen from the following strikingly simple calculation. I adopt the kinematic model of the expanding universe.

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  1. Nature, 155, 133 (1945).

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MILNE, E. The Ageing of Light. Nature 155, 234 (1945). https://doi.org/10.1038/155234a0

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