The statements observed light shifts to a longer wavelength, indicating receding galaxies and the light source and observer moving farther apart are all issues that describe redshifts.
Redshift is a term used in the physics discipline to describe a given increase in the emitted wavelength associated with less photon energy, which was described by observing galaxies that shifted to more extended wavelengths.
In conclusion, the statements observed light shifts to a longer wavelength, indicating receding galaxies and the light source and observer moving farther apart are all issues that describe redshifts.
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