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Encyclopedia > Blue shift

Blue shift is the opposite of redshift, the latter being much more noted due to its importance to modern astronomy. Redshift describes a change in the wavelength of light, in which the wavelength is longer, or redder, than when it was emitted at the source. ... In ancient Greece and other early civilizations, astronomy consisted largely of astrometry, measuring positions of stars and planets in the sky. ...

Blue shift is the phenomenon that the frequency of an electromagnetic wave (such as light) emitted by a source moving towards the observer is shifted towards the blue side of the electromagnetic spectrum (that is, its wavelength is decreased). Sine waves of various frequencies; the lower waves have higher frequencies than those above. ... Electromagnetic radiation is a propagating wave in space with electric and magnetic components. ... Prism splitting light Light is electromagnetic radiation with a wavelength that is visible to the eye or, in a technical or scientific setting, electromagnetic radiation of any wavelength. ... For other uses, see Blue (disambiguation) Blue is one of the three primary additive colors; blue light has the shortest wavelength range (about 420-490 nanometres) of the three primary colors. ... The electromagnetic spectrum is the range of all possible electromagnetic radiation. ... The wavelength is the distance between repeating units of a wave pattern. ...

The phenomenon of shifting wavelengths in frames of reference moving relatively to each other is commonly known as Doppler shift or Doppler effect. Sound waves emanating from an ambulance moving to the right. ...

While the general redshift of starlight is seen as proof for an expanding universe, there are a few examples of blue shift in astronomy: Redshift describes a change in the wavelength of light, in which the wavelength is longer, or redder, than when it was emitted at the source. ...

The Andromeda Galaxy is moving towards our own Milky Way Galaxy within the Local Group; thus, when observed from earth, its light is undergoing a blue shift.
When observing spiral galaxies, the side spinning towards us will have a slight blue shift (see Tully-Fisher relation).
Also, Blazars are known to propel relativistic jets towards us, emitting synchrotron radiation and Bremsstrahlung that appears blue shifted.

This image is a Galaxy Evolution Explorer observation of the large galaxy in Andromeda, Messier 31. ... A NASA artists conception of what the Milky Way would look like if seen off-axis. ... NGC 4414, a typical spiral galaxy in the constellation Coma Berenices, is about 56,000 light years in diameter and approximately 60 million light years distant. ... Map of the local group The Local Group is the group of galaxies that includes our galaxy, the Milky Way. ... In astronomy, the Tully-Fisher relation, published by astronomers R. Brent Tully and J. Richard Fisher in 1977, is a standard candle that measures the distance to rotating spiral galaxies by the width of the galaxys spectral lines. ... A blazar is a galaxy with a very compact and highly variable energy source at the center of the host galaxy. ... Albert Einsteins theory of relativity is a set of two theories in physics: special relativity and general relativity. ... A jet is a stream of fluid produced by discharge through an orifice into free space. ... Synchrotron radiation is electromagnetic radiation, similar to cyclotron radiation, but generated by the acceleration of relativistic electrons (i. ... Bremsstrahlung, German for braking radiation, is electromagnetic radiation produced by the acceleration of a charged particle, such as an electron, when deflected by another charged particle, such as an atomic nucleus. ...

See also

  Results from FactBites:
blue shift - Encyclopedia.com (1162 words)
blue shift or blueshift, in astronomy, the systematic displacement of individual lines in the spectrum of a celestial object toward the blue, or shorter wavelength, end of the visible spectrum.
Most observed blue shifts are the result of the Doppler effect.
The blue shift is the opposite of the red shift.
Review - Half-Life: Blue Shift // PC /// Eurogamer (1206 words)
Blue Shift started life as a value-added episode for the ill-fated Half-Life Dreamcast, and we should have twigged from that that it would be somewhat brief.
Blue Shift is downright tiny, taking a mere three hours to complete for hardened Half-Life players.
If you have a yearning for more Half-Life, Blue Shift will definitely satisfy you for a little while, but this is probably the original Half-Life's swansong, and it would have been nice to see them take things a step beyond the cut and paste action format.
  More results at FactBites »



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