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- Redshift abstract "In physics, redshift happens when light or other electromagnetic radiation from an object is increased in wavelength, or shifted to the red end of the spectrum. In general, whether or not the radiation is within the visible spectrum, "redder" means an increase in wavelength – equivalent to a lower frequency and a lower photon energy, in accordance with, respectively, the wave and quantum theories of light.Some redshifts are an example of the Doppler effect, familiar in the change in the apparent pitches of sirens and frequency of the sound waves emitted by speeding vehicles. A redshift occurs whenever a light source moves away from an observer. Another kind of redshift is Cosmological redshift, which is due to the expansion of the universe, and sufficiently distant light sources (generally more than a few million light years away) show redshift corresponding to the rate of increase in their distance from Earth. Finally, gravitational redshifts are a relativistic effect observed in electromagnetic radiation moving out of gravitational fields. Conversely, a decrease in wavelength is called blueshift and is generally seen when a light-emitting object moves toward an observer or when electromagnetic radiation moves into a gravitational field.Although knowledge of redshifts and blueshifts has been applied to develop several terrestrial technologies (such as Doppler radar and radar guns), redshifts are most famously seen in the spectroscopic observations of astronomical objects.A special relativistic redshift formula (and its classical approximation) can be used to calculate the redshift of a nearby object when spacetime is flat. However, in many contexts, such as black holes and Big Bang cosmology, redshifts must be calculated using general relativity. Special relativistic, gravitational, and cosmological redshifts can be understood under the umbrella of frame transformation laws. There exist other physical processes that can lead to a shift in the frequency of electromagnetic radiation, including scattering and optical effects; however, the resulting changes are distinguishable from true redshift and are not generally referred to as such (see section on physical optics and radiative transfer).".
- Redshift thumbnail Redshift.png?width=300.
- Redshift wikiPageExternalLink redshift.html.
- Redshift wikiPageExternalLink tut29-1.htm.
- Redshift wikiPageExternalLink doppler.htm.
- Redshift wikiPageExternalLink hu_animexp.gif.
- Redshift wikiPageExternalLink article.cfm?chanID=sa006&colID=1&articleID=0009F0CA-C523-1213-852383414B7F0147.
- Redshift wikiPageID "26262".
- Redshift wikiPageRevisionID "602699844".
- Redshift hasPhotoCollection Redshift.
- Redshift subject Category:Astronomical_spectroscopy.
- Redshift subject Category:Doppler_effects.
- Redshift subject Category:Physical_cosmology.
- Redshift subject Category:Physical_quantities.
- Redshift comment "In physics, redshift happens when light or other electromagnetic radiation from an object is increased in wavelength, or shifted to the red end of the spectrum.".
- Redshift label "Corrimiento al rojo".
- Redshift label "Desvio para o vermelho".
- Redshift label "Décalage vers le rouge".
- Redshift label "Przesunięcie ku czerwieni".
- Redshift label "Redshift".
- Redshift label "Roodverschuiving".
- Redshift label "Rotverschiebung".
- Redshift label "Spostamento verso il rosso".
- Redshift label "Красное смещение".
- Redshift label "انزياح أحمر".
- Redshift label "紅移".
- Redshift label "赤方偏移".
- Redshift sameAs Rudý_posuv.
- Redshift sameAs Rotverschiebung.
- Redshift sameAs Corrimiento_al_rojo.
- Redshift sameAs Décalage_vers_le_rouge.
- Redshift sameAs Pergeseran_merah.
- Redshift sameAs Spostamento_verso_il_rosso.
- Redshift sameAs 赤方偏移.
- Redshift sameAs 적색편이.
- Redshift sameAs Roodverschuiving.
- Redshift sameAs Przesunięcie_ku_czerwieni.
- Redshift sameAs Desvio_para_o_vermelho.
- Redshift sameAs m.06jyj.
- Redshift sameAs Q76250.
- Redshift sameAs Q76250.
- Redshift wasDerivedFrom Redshift?oldid=602699844.
- Redshift depiction Redshift.png.
- Redshift isPrimaryTopicOf Redshift.
