In astronomy, the 2dF Galaxy Redshift Survey (Two-degree-Field Galaxy Redshift Gurvey), or 2dFGRS is a redshift survey conducted by the Anglo-Australian Observatory in the 1990s. This survey determined the large-scale structure in one section of the local Universe. In ancient Greece and other early civilizations, astronomy consisted largely of astrometry, measuring positions of stars and planets in the sky. ... In astronomy, a redshift survey is a survey of a section of the sky to measure the redshift of astronomical objects. ... The Anglo-Australian Observatory is an optical astronomy observatory located in the Warrumbungles National Park, near the town of Coonabarabran, Australia. ...
This redshift phenomenon was first predicted and observed in the nineteenth century as scientists began to consider the dynamical implications of the wave-nature of light.
Most famously, redshifts are observed in the spectra from distant galaxies, quasars, and intergalactic gas clouds to increase proportionally with the distance to the object.
Redshift (and blueshift) may be characterized by the relative difference between the observed and emitted wavelengths (or frequency) of an object.
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