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Originally Posted by Richard J. Hanak
Since a photon is not extended in the direction of its propagation and since wavelength is not intrinsic to a photon, how can the expansion of space increase the time of a photon's period during its travel through space?
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Just recently I have been asking similar kind of questions in "Let's create steady state theory" thread, and based on that discussion I assume that nobody knows the answer for your question. It seems that the mechanism for the redshift is not actually known even for the Big Bang theory.