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The law of conservation of energy, which states that the amount of energy in a system is constant. For questions about Earth's environment, see the climate-science tag instead.

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When light gets red shifted by the expending universe it's energy decreases. What happens to... [duplicate]

If a Photon of light is red shifted its wavelength increases and therefore its energy decreases. What happens to that energy as energy should be conserved right?
Jakob Boyes-Jensen's user avatar