Astronomy Picture of the Day

   [1]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
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                        Supernova 2025rbs in NGC 7331
             Image Credit: [3]Ben Godson (University of Warwick)

   Explanation: A long time ago in a galaxy 50 million light-years away,
   [4]a star exploded. Light from that [5]supernova was first detected by
   telescopes on planet Earth on July 14th though, and the extragalactic
   transient is now known to astronomers as [6]supernova 2025rbs.
   [7]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. [8]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, [9]NGC 7331 is often touted as an analog to our
   own Milky Way.

                     Tomorrow's picture: pixels in space
     __________________________________________________________________

      [10]< | [11]Archive | [12]Submissions | [13]Index | [14]Search |
   [15]Calendar | [16]RSS | [17]Education | [18]About APOD | [19]Discuss |
                                    [20]>
     __________________________________________________________________

    Authors & editors: [21]Robert Nemiroff ([22]MTU) & [23]Jerry Bonnell
                                 ([24]UMCP)
          NASA Official: Amber Straughn [25]Specific rights apply.
            [26]NASA Web Privacy, [27]Accessibility, [28]Notices;
                A service of: [29]ASD at [30]NASA / [31]GSFC,
                         [32]NASA Science Activation
                           & [33]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2507/2025rbsAnnotated1024.png
   3. https://warwick.ac.uk/fac/sci/physics/research/astro/people/bengodson/
   4. https://science.nasa.gov/resource/type-ia-supernova/
   5. https://goto-observatory.org/bright-supernova-2025rbs-discovered-by-goto/
   6. https://www.wis-tns.org/object/2025rbs
   7. https://rochesterastronomy.org/supernova.html
   8. https://science.nasa.gov/mission/roman-space-telescope/type-ia-supernovae/
   9. https://apod.nasa.gov/apod/ap220922.html
  10. https://apod.nasa.gov/apod/ap250730.html
  11. https://apod.nasa.gov/apod/archivepix.html
  12. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  13. https://apod.nasa.gov/apod/lib/aptree.html
  14. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  15. https://apod.nasa.gov/apod/calendar/allyears.html
  16. https://apod.com/feed.rss
  17. https://apod.nasa.gov/apod/lib/edlinks.html
  18. https://apod.nasa.gov/apod/lib/about_apod.html
  19. https://asterisk.apod.com/discuss_apod.php?date=250731
  20. https://apod.nasa.gov/apod/ap250801.html
  21. http://www.phy.mtu.edu/faculty/Nemiroff.html
  22. http://www.phy.mtu.edu/
  23. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  24. http://www.astro.umd.edu/
  25. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  26. https://www.nasa.gov/about/highlights/HP_Privacy.html
  27. https://www.nasa.gov/general/accessibility/
  28. https://www.nasa.gov/privacy/
  29. https://astrophysics.gsfc.nasa.gov/
  30. https://www.nasa.gov/
  31. https://www.nasa.gov/centers/goddard/
  32. https://science.nasa.gov/learners
  33. http://www.mtu.edu/