blue shift

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blue shift

or

blueshift,

in astronomy, the systematic displacement of individual lines in the spectrumspectrum,
arrangement or display of light or other form of radiation separated according to wavelength, frequency, energy, or some other property. Beams of charged particles can be separated into a spectrum according to mass in a mass spectrometer (see mass spectrograph).
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 of a celestial object toward the blue, or shorter wavelength, end of the visible spectrum. The amount of displacement is a function of the object's relative velocity toward the observer. Most observed blue shifts are the result of the Doppler effectDoppler effect,
change in the wavelength (or frequency) of energy in the form of waves, e.g., sound or light, as a result of motion of either the source or the receiver of the waves; the effect is named for the Austrian scientist Christian Doppler, who demonstrated the effect
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. The blue shift is the opposite of the red shiftred shift
or redshift,
in astronomy, the systematic displacement of individual lines in the spectrum of a celestial object toward the red, or longer wavelength, end of the visible spectrum. The effect was discovered by V. M. Slipher of Lowell Observatory.
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. Blue shifted celestial bodies are quite rare. Of the billions of known galaxies, only about 100, including the AndromedaAndromeda,
in astronomy, northern constellation located to the NE of Pegasus and to the S of Cassiopeia. Its brightest star, Alpheratz (Alpha Andromedae), marks the northeast corner of the Great Square in Pegasus.
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 galaxy, are blue shifted.

blue shift

[′blü ‚shift]
(astronomy)
A displacement of lines in the spectrum of a celestial object toward shorter wavelengths, indicating motion of the object toward the observer.
References in periodicals archive ?
Since the center-frequency of CMB is much lower than extra-galactic-light, the cumulative-phase-alteration results in red-shift; and since the center-frequency of CMB is higher than the radio-frequency-signals (2110 MHz for the uplink from Earth and 2292 MHz for the downlink to Earth) used to measure velocity of Pioneer-10, Pioneer-11, Galileo and Ulysses space-probes, the cumulative-phase-alteration resulted in blue-shift, leading to the interpretation of deceleration of these space-probes.
The associated source-motion effect has except for admitting a relativistic effect connected to high source velocity thus far been taken as no different from the ordinary Doppler effect that consists in a red- or blue-shift depending on the source is moving away or toward the observer.