blue-shift

blueshift

[bloo-shift]
noun Astronomy.
a shift toward shorter wavelengths of the spectral lines of a celestial object, caused by the motion of the object toward the observer.
Also, blue shift.


Origin:
1950–55; blue + shift

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World English Dictionary
blueshift (ˈbluːˌʃɪft)
 
n
Compare redshift a shift in the spectral lines of a stellar spectrum towards the blue end of the visible region relative to the wavelengths of these lines in the terrestrial spectrum: a result of the Doppler effect caused by stars approaching the solar system

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