The technical name of this supernova remnant is SNR G249.5+24.5, but the astronomers who discovered it dubbed it Hoinga, after the medieval name of the first author's hometown, Bad Hönningen am Rhein. Zoom In The Hoinga supernova remnant (upper right) seen in X-rays (converted to colors representing the energies of the X-rays) by eROSITA. The bright blob at the bottom is actually two supernova remnants: Vela and Puppis A. Credit: SRG/eROSITA They found it in observations taken by a mission called eROSITA (extended Röntgen Survey Imaging Telescope Array; Röntgen is the German word for X-rays, after their discoverer). This is a space-based X-ray observatory on board a German-Russian spacecraft called Spectrum-Roentgen-Gamma, which orbits the Sun about 1.5 million kilometers from the Earth in a spot called the L2 point, a volume of space where a spacecraft can remain semi-stable without too much effort.