The most distant quasar yet discovered sets constraints on the formation mechanism of black holes. Its light spectrum has tantalizing features that are expected to be observed before the reionization epoch ended. See Letter p.616
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Willott, C. A monster in the early Universe. Nature 474, 583–584 (2011). https://doi.org/10.1038/474583a
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DOI: https://doi.org/10.1038/474583a
