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Intermittent Black Hole Jets Are Like A 'Cosmic Volcano'
Supermassive black holes grow larger by accreting matter. When they're actively accreting matter they're called active galactic nuclei (AGN). AGN are the most luminous sources of persistent radiation in the Universe, yet they turn on and off as the SMBH passes through quiet and active phases. Astronomers have found one that is just turning on its powerful jets after a long period of dormancy.
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