The '''Sloan Digital Sky Survey''' or '''SDSS''' is a major multi-spectral imaging and spectroscopic [[redshift survey]]
...million objects and [[Spectrophotometry|spectra]] for more than 3 million objects. The main galaxy sample has a median [[redshift]] of ''z'' = 0.1;
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...ef> is the [[hypothesis]] that the [[redshift]]s of cosmologically distant objects (in particular [[galaxies]] and [[quasars]]) tend to cluster around multipl
...out errors in measurement or analysis, quantized redshift of cosmological objects would either indicate that they are physically arranged in a quantized patt
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...to be identified as what we now know [[quasar]]s to be—extremely luminous objects at cosmological distances.
...tp://www.sky-map.org/?object=3C%20273&zoom=12&img_source=SDSS SKY-MAP.ORG SDSS image of 3C 273]
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...p later used the atlas as evidence in his debate on [[Quasar|quasi-stellar objects]] (QSOs).
...in the atlas are referred to primarily by their Arp number. Many of these objects (particularly [[Arp 220]]) are also used as spectral templates for studying
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# Objects observed in [[extragalactic space|deep space]] - extragalactic space, 10 [[
The motion of astronomical objects due solely to this expansion is known as the '''Hubble flow'''.<ref>
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...]]. However, all these processes would also tend to blur images of distant objects, and no such blurring has been detected.<ref>{{cite web|url=http://www.astr
...eing the cores of distant AGN, were actually much closer and were starlike-objects ejected from the centers of nearby AGN with high intrinsic redshifts. Arp a
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