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Bojan wrote-“Photon is stable and does not decay. We can detect it even if it is coming from near the edge of the visible Universe.
What is happening, thought, wavelength is changed (it becomes longer) because of expansion of the universe (similar to Doppler effect), so the photons from the edge of the visible Universe would have wavelengths infinitely long (frequency would have been zero, energy also zero).”
Is no this just fancy way to say that the photon decayed to nothing? By this definition it would become DC current with zero voltage. Where did the original energy it had go to? What happen to the law of conservation of energy?
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