blueshift

[bloo-shift]

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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

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Link To blueshift

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Blueshift is always a great word to know.

So is absolute magnitude. Does it mean:

a star in an intermediate stage of evolution, characterized by a large volume, low surface temperature, and reddish hue

the magnitude of a star as it would appear to a hypothetical observer at a distance of 10 parsecs or 32.6 light-years

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Collins

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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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blueshift

blue·shift