The "active galactic nucleus" phase of the supermassive black hole at the heart of the galaxy Arp 187 has apparently just ended.
Astronomers spot 3,000 light-year 'light echo' of dying supermassive black hole
Live Science - 2 Jul 2021 13:39
The "active galactic nucleus" phase of the supermassive black hole at the heart of the galaxy Arp 187 has apparently just ended.
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