Nature Astronomy, Published online: 17 June 2024; doi:10.1038/s41550-024-02280-1

Although stars and galaxies have developed over time, it seems that supermassive black holes already existed at the ‘cosmic dawn’ of the Universe. Analysis of the mid-infrared spectrum of an early quasar (a quasi-stellar object powered by a black hole) suggests that supermassive black holes and their feeding mechanisms were already completely mature when the Universe was 5% of its present age.

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