Highest redshifts
Currently, the objects with the highest known redshifts are galaxies and the objects producing gamma ray bursts. The most reliable redshifts are from spectroscopic data, and the highest confirmed spectroscopic redshift of a galaxy is that of UDFy-38135539 at a redshift of 
, corresponding to just 600 million years after the Big Bang. The previous record was held by IOK-1, at a redshift 
, corresponding to just 750 million years after the Big Bang. Slightly less reliable are Lyman-break redshifts, the highest of which is the lensed galaxy A1689-zD1 at a redshift 
and the next highest being 
. The most distant observed gamma ray burst was GRB 090423, which had a redshift of 
. The most distant known quasar, ULAS J1120+0641, is at 
.The highest known redshift radio galaxy (TN J0924-2201) is at a redshift 
and the highest known redshift molecular material is the detection of emission from the CO molecule from the quasar SDSS J1148+5251 at 
, corresponding to just 600 million years after the Big Bang. The previous record was held by IOK-1, at a redshift , corresponding to just 750 million years after the Big Bang. Slightly less reliable are Lyman-break redshifts, the highest of which is the lensed galaxy A1689-zD1 at a redshift and the next highest being . The most distant observed gamma ray burst was GRB 090423, which had a redshift of . The most distant known quasar, ULAS J1120+0641, is at .The highest known redshift radio galaxy (TN J0924-2201) is at a redshift and the highest known redshift molecular material is the detection of emission from the CO molecule from the quasar SDSS J1148+5251 at
Extremely red objects (EROs) are astronomical sources of radiation that radiate energy in the red and near infrared part of the electromagnetic spectrum. These may be starburst galaxies that have a high redshift accompanied by reddening from intervening dust, or they could be highly redshifted elliptical galaxies with an older (and therefore redder) stellar population. Objects that are even redder than EROs are termed hyper extremely red objects (HEROs).
The cosmic microwave background has a redshift of 
, corresponding to an age of approximately 379,000 years after the Big Bang and a comoving distance of more than 46 billion light years. The yet-to-be-observed first light from the oldest Population III stars, not long after atoms first formed and the CMB ceased to be absorbed almost completely, may have redshifts in the range of 
. Other high-redshift events predicted by physics but not presently observable are the cosmic neutrino background from about two seconds after the Big Bang (and a redshift in excess of 
) and the cosmic gravitational wave background emitted directly from inflation at a redshift in excess of 
.
, corresponding to an age of approximately 379,000 years after the Big Bang and a comoving distance of more than 46 billion light years. The yet-to-be-observed first light from the oldest Population III stars, not long after atoms first formed and the CMB ceased to be absorbed almost completely, may have redshifts in the range of . Other high-redshift events predicted by physics but not presently observable are the cosmic neutrino background from about two seconds after the Big Bang (and a redshift in excess of ) and the cosmic gravitational wave background emitted directly from inflation at a redshift in excess of .
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