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redshift

redshift

noun red·shift \ˈred-ˈshift\

Definition of REDSHIFT

:  a displacement of the spectrum of a celestial body toward longer wavelengths that is a consequence of the Doppler effect or the gravitational field of the source; also :  a measurement of a celestial body's redshift equal to the ratio of the displacement of a spectral line to its known unshifted wavelength and used especially to calculate the body's distance from earth
red·shift·ed adjective

First Known Use of REDSHIFT

1923

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