1. From supernova to something much more intriguing at the core of galaxy 253-3  NASASpaceflight.com
  2. Astronomers Find Periodically Flaring Black Hole in Distant Galaxy | Astronomy  Sci-News.com
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On 14 November 2014, a bright flash flagged the All Sky Automated Survey for Supernovae,…

From supernova to something much more intriguing at the core of galaxy 253-3 - NASASpaceFlight.com

An active galactic nucleus in the center of ESO 253-G003, an active galaxy over 570 million light-years away in the southern constellation of Pictor, erupts roughly every 114 days, according to a paper to be published in the Astrophysical Journal.An active galactic nucleus in the center of ESO 253-G003, an active galaxy over 570 million light-years away in the southern constellation of Pictor, erupts roughly every 114 days, according to a paper to be published in the Astrophysical Journal.

Astronomers Find Periodically Flaring Black Hole in Distant Galaxy | Astronomy | Sci-News.com