"The gas is heated up to millions of degrees, and its radiation then influences the whole galaxy. It stops gas clumping together to form stars, pausing star formation in a way that's important to produce realistic galaxies. The energy [from supermassive black holes] can then travel out even further and influence the large-scale structure of the universe — which is really important for cosmology and understanding cosmic evolution."
https://www.livescience.com/space/black-holes/webb-has-shown-us-they-are-clearly-wrong-how-astrophysicist-sophie-koudamis-research-on-supermassive-black-holes-is-rewriting-the-history-of-our-universe
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