This is a news story, published by Ars Technica, that relates primarily to AGN news.
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Andromeda GalaxyArs Technica
•87% Informative
SDSS1335_0728 , 300 million light-years away, suddenly brightened after decades of quietude.
Astronomers think it is most likely an active galactic nucleus ( AGN ), which gets its energy from supermassive black holes at the galaxy's center and/or from the black hole's spin.
The authors acknowledge the possibility that it might also be some kind of rare tidal disruption event ( TDE ).
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