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In general, any "tired light" mechanism must solve some basic problems, in that the observed redshift must: admit the same measurement in any wavelength-band not exhibit blurring follow the detailed Hubble relation observed with supernova data (see accelerating universe) explain associated time dilation of cosmologically distant events.
I heard on the radio a Swedish Professor of astronomy that said that he did not believe in dark energy. He believed that the photons emitted billions of light years away lost energy while travelling through space, and since light can’t slow down it looses energy by red shifting. Similar to light leaving a heavy object and gets red shifted. The farther away from us the light was emitted the more energy it will have lost and the more red shifted it would be giving the appearance of an accelerating expansion of the universe.It seems reasonable to me that a photon when it has travelled billions of light years will have lost some energy thus getting red shifted. Have you heard this theory before? Any thoughts on this?