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Insight
Nature 440, 1125 (27 April 2006) | doi:10.1038/4401125a; Published online 26 April 2006
Introduction Early Universe
Leslie Sage1
Cosmology has come a long way in a rather short time. When I was a graduate student 20 years ago, a galaxy with a high redshift was one at z 
1 (and quasars were known out to z 2).
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