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physical phenomena > process > physical process > optical process > radiation modification > wavelength shift > Doppler shift > blueshift

blueshift comparison table

Subject	is a kind of	has definition
Doppler shift	wavelength shift	The shift in the received frequency and wavelength of a sound wave or electromagnetic wave that occurs when either the source or the observer are in motion. Approach causes a shift toward shorter wavelengths and higher frequencies, called a blueshift. Recession has the opposite effect, called a redshift.
blueshift	Doppler shift	The shift of spectral lines toward shorter wavelengths in the spectrum of an approaching source of radiation.

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