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

redshift
subject			fact

redshift	has value z = Δλ/λ where λ is the laboratory wavelength of the spectral line and Δλ is the difference between the laboratory and the observed wavelengths
	has definition The shift of spectral lines toward longer wavelengths in the spectrum of a receding source of radiation.
	is a kind of Doppler shift
wavelength shift	changes property frequency (and wavelength)
optical process	has domain optics