What phenomenon occurs when a light source is moving away from an observer, shifting the light toward longer wavelengths?
Answer
Redshift
Redshift is the observational result of a light source moving away from an observer. As the source moves further away, the light waves emitted are stretched out. On the visible light spectrum, this stretching shifts the light toward the red end, which consists of longer wavelengths. This consistent observation of redshift in distant galaxies is a primary piece of evidence indicating that the universe is currently in a state of expansion.
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