If space didn't expand/accelerate, would photons keep zipping along forever in the same wavelength in which they were emitted?
2 years ago by niktemadur to c/askscience
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Yes, the wavelength of photons will be preserved if they travel through non-expanding space. If the photon is emitted by a source that’s in motion with respect to a detector, there could still be redshift or blueshift from the relativistic Doppler effect. This would only depend on the relative velocity between the emitter and observer, and not on the distance the photon traveled between them.
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