This Black Hole Made Astronomers Puzzled
<p>In 2018, astronomers were alerted by a strange phenomenon detected by the All-Sky Automated Survey for Super-Novae (ASSASN). A supermassive black hole, which belonged in the class called Active Galactic...
https://www.neatorama.com/2020/07/20/This-Black-Hole-Made-Astronomers-Puzzled/