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- W2000813989 abstract "LABORATORY measurements have duly verified that the velocity of light is independent of the velocity of the source to an accuracy of 1.3 in 104 for γ-rays from π0 meson decay at 6 GeV (ref. 1) and is also isotropic to better than 6 in 108 (ref. 2), 2 in 108 (ref. 3) and 2 in 1010 (ref. 4) in a frame of reference attached to the Earth. The best evidence that the velocity of light is independent of frequency probably depends on astronomical observations of Cepheids in the nearest galaxies, and makes it possible to set a limit of 1 in 108 on dispersion. Somewhat poorer limits over a much wider range of frequencies, from the visible to the radio-frequency region, have been provided by observations of flare stars5." @default.
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- W2000813989 title "Improved Limit on the Absence of Dispersion of the Velocity of Light" @default.
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- W2000813989 doi "https://doi.org/10.1038/223161a0" @default.
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