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WordReference Random House Unabridged Dictionary of American English © 2024red•shift (red′shift′),USA pronunciation n. [Astron.]- Astronomya shift toward longer wavelengths of the spectral lines emitted by a celestial object that is caused by the object moving away from the earth.
Also, red′ shift′. Cf. cosmological redshift, Doppler effect, gravitational redshift. Collins Concise English Dictionary © HarperCollins Publishers:: redshift /ˈredˌʃɪft/ n - a shift in the lines of the spectrum of an astronomical object towards a longer wavelength (the red end of an optical spectrum), relative to the wavelength of these lines in the terrestrial spectrum, usually as a result of the Doppler effect caused by the recession of the object
Compare: blueshift
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