What phenomenon describes light shifting toward the redder, longer wavelengths from a distant star?
Answer
Redshift
Redshift occurs specifically when a star is moving away from the observer, in this case, Earth. As the star recedes, the light waves it emits are stretched out. This stretching corresponds to an increase in wavelength, pushing the observed spectral signature towards the redder, lower-frequency end of the electromagnetic spectrum. This measurable shift provides direct evidence of recessional movement relative to the observer.
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