In cosmological redshifting, photons lose energy because of the expansion of the universe.
Bur what actually happens to this energy? Is it just “lost” or is it physically destroyed (which would seem impossible)? If it is lost, what is it lost to or what does it become?
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The energy is the same, it’s our frame of reference that makes it appear different. Just like a siren sounds higher when coming toward you and lower as it drives away. The siren stays the same, your perception is thrown off by your relative frame of reference.
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