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Old before their time

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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Figure 1: Journey to the early Universe.

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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