Supermassive black holes are thought to keep star formation under control by ejecting or stirring gas in galaxies. Observations of an old galaxy reveal a potential mechanism for how this process occurs. See Letter p.504
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Sarzi, M. How black holes restrain old galaxies. Nature 533, 473–474 (2016). https://doi.org/10.1038/533473a
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DOI: https://doi.org/10.1038/533473a
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