Definitions from Wiktionary (blueshift)

▸ noun:  (physics: astronomy, relativity) A decrease in the wavelength of a photon or of light, corresponding to a higher frequency and a shift toward the blue end of the electromagnetic spectrum.
▸ verb:  (physics: astronomy, relativity)(ambitransitive) (said of a photon or a beam of light) To shift toward the blue end of the electromagnetic spectrum; to change to a shorter wavelength and a higher frequency.




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