Redshift is usually caused by the Doppler effect, which occurs when a source of waves and an observer move with respect to each other, resulting in a change in wavelength received by the observer. In the case of redshift, the observer and the object are moving away from each other, shifting the spectrum of the object to longer (red) wavelengths.
verifiedCite
While every effort has been made to follow citation style rules, there may be some discrepancies.
Please refer to the appropriate style manual or other sources if you have any questions.
Select Citation Style