The discovery of massive, evolved galaxies at much greater distances than expected — and hence at earlier times in the history of the Universe — is a challenge to our understanding of how galaxies form.
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NASA/ESA/S. BECKWITH (STSCI)/HUDF TEAM
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Wirth, G. Old before their time. Nature 430, 149–150 (2004). https://doi.org/10.1038/430149a
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DOI: https://doi.org/10.1038/430149a
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