Light from distant objects is being stretched by the expansion of the universe, such that light that was ie blue (short wavelength) gets shifted to red (long wavelength). As short wavelength light has inherently more energy than long wavelength light, and as energy cannot be destroyed, where does the lost energy go when light is redshifted?

TY!

2 hours ago, Muster Mark said:

Light from distant objects is being stretched by the expansion of the universe, such that light that was ie blue (short wavelength) gets shifted to red (long wavelength). As short wavelength light has inherently more energy than long wavelength light, and as energy cannot be destroyed, where does the lost energy go when light is redshifted?

TY!

Look at the model of the universe with zero energy. https://en.wikipedia.org/wiki/Zero-energy_universe The energy of photons in the Universe decreases and at the same time its gravitational energy decreases.