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As light gets redshifted traveling long distances, does it lose energy since longer wavelengths have less energy than shorter wavelengths?
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Let’s say a particle of light is moving between galaxies and has a certain amount of energy. As the universe expands, the wavelength of that light lengthens. But longer wavelengths have less energy. Would this particle then lose energy? If so, where does the energy go?
Edit: Found an article that gives a good answer to this: https://www.forbes.com/sites/startswithabang/2015/12/19/ask-ethan-when-a-photon-gets-redshifted-where-does-the-energy-go/
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