Cosmic Naps: The Dormant Giant Black Hole Shaking Up Our View of the Early Universe

A behemoth supermassive black hole, weighing about 400 million suns, is found in a surprisingly small galaxy just 800 million years after the Big Bang. Rather than steady feeding, evidence points to bursts of rapid growth followed by long quiescent periods—a start-and-stop model that could rewrite how black holes form and evolve. In this episode, we break down the Nature paper, the JWST observations, and the simulations behind this cosmic detective story, plus what this dormant giant means for the population of black holes in the early universe.

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