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                           Astronomy Picture of the Day   
      
       Discover the cosmos! Each day a different image or photograph of our   
         fascinating universe is featured, along with a brief explanation   
                       written by a professional astronomer.   
      
                                   2025 July 31   
      
                           Supernova 2025rbs in NGC 7331   
                 Image Credit: Ben Godson (University of Warwick)   
      
      Explanation: A long time ago in a galaxy 50 million light-years away, a   
      star exploded. Light from that supernova was first detected by   
      telescopes on planet Earth on July 14th though, and the extragalactic   
      transient is now known to astronomers as supernova 2025rbs. Presently   
      the brightest supernova in planet Earth's sky, 2025rbs is a Type Ia   
      supernova, likely caused by the thermonuclear detonation of a white   
      dwarf star that accreted material from a companion in a binary star   
      system. Type Ia supernovae are used as standard candles to establish   
      the distance scale of the universe. The host galaxy of 2025rbs is NGC   
      7331. Itself a bright spiral galaxy in the northern constellation   
      Pegasus, NGC 7331 is often touted as an analog to our own Milky Way.   
      
                        Tomorrow's picture: pixels in space   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Amber Straughn Specific rights apply.   
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                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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