Redshift refers to the lengthening of light waves from celestial objects as they move away from Earth. This phenomenon is a result of the Doppler effect, where the wavelength of light is stretched (shifted towards the red end of the spectrum) as the source of light moves away from the observer.
In the context of stars and galaxies, redshift indicates that these objects are moving away from Earth. This is a key piece of evidence supporting the theory of the expanding universe, as the redshift of distant galaxies suggests that the universe is expanding and all objects are moving away from each other.
Stars and galaxies are redshifts.what does that mean
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