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Blue shift is one example of the Doppler effect. It is the opposite effect to redshift.
Doppler blueshift is caused by movement of a source towards the observer. The term applies to any decrease in wavelength caused by relative motion, even outside the visible spectrum.
The wavelength of any reflected or emitted photon or other particle is shortened in the direction of travel.
Doppler blueshift is used in astronomy to determine relative motion: