There a whole set of theories, called "Tired light" theories, which tries to explain Cosmological Red Shift by degradation of photons with time. Buy they requir

There a whole set of theories, called "Tired light" theories, which tries to explain Cosmological Red Shift by degradation of photons with time. Buy they require whole set of different cosmological principles: a medium for light propagation is required to dump lost energy into, no Big Bang. But even with a tired light theory, galaxies are accelerating toward attractors, see https://arxiv.org/pdf/1702.02483v1.pdf https://arxiv.org/pdf/1702.02483v1.pdf https://www.youtube.com/watch?v=NpV0GQo3P0c https://www.youtube.com/watch?v=NpV0GQo3P0c