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redshift comparison table
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Doppler shiftwavelength shiftthe amount of shift is directly proportional to relative velocityThe 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.
redshiftDoppler shiftz = Δλ/λ where λ is the laboratory wavelength of the spectral line and Δλ is the difference between the laboratory and the observed wavelengthsThe shift of spectral lines toward longer wavelengths in the spectrum of a receding source of radiation.

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