blueshift
noun
blue·shift
ˈblü-ˈshift 
: the displacement of the spectrum of an approaching celestial body toward shorter wavelengths
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Astronomers first studied faraway star surfaces by looking at the redshift or blueshift of light coming from the stars, a technique called Doppler imaging that reveals movement on the stars' surfaces.
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Jay Bennett, Popular Mechanics, 1 Feb. 2018
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Jay Bennett, Popular Mechanics, 1 Feb. 2018
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“Blueshift.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/blueshift. Accessed 30 Jun. 2025.
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