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.

                                 2026 July 2
   [2]Against a bright field of stars, a yellow nebula with blue details,
        a purple filament on the left and a bright star on the right.

                         Sibling Supernova Remnants
   Image Credit: [3]NASA Goddard Space Flight Center and [4]M. Michailidis
                   et al. 2026; optical: [5]DSS; infrared:
          [6]NASA/[7]WISE/[8]JPL-[9]Caltech/[10]UCLA; ultraviolet:
                             [11]NASA/[12]Swift
   Text: [13]Cecilia Chirenti ([14]NASA [15]GSFC, [16]UMCP, [17]CRESST II)

   Explanation: What happens when one of the stars in a [18]binary goes
   supernova? This [19]image combines visible (yellow), ultraviolet
   (purple) and infrared light (cyan, red and orange) to show two
   [20]supernova remnants and their surrounding environment, about 6,000
   light-years away. The younger one is the well-known [21]Jellyfish
   Nebula in the center (mostly in yellow). If we could see it by eye, it
   would appear [22]larger than the full moon in the sky. The filament
   shown in purple is part of an older, overlapping supernova remnant,
   [23]G189.6+3.3. A [24]new study used data from [25]NASA's [26]Fermi
   Gamma-ray Space Telescope to piece together their [27]story.
   Astronomers believe that there were two stars in a binary system, then
   the first one exploded as a supernova, [28]kicking away its companion,
   which also exploded as a supernova tens of thousands of years later,
   creating the superimposed supernova remnants we see today. The bright
   star on the right is actually a triple star system named [29]Propus.

                      Tomorrow's picture: What's next?
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    Authors & editors: [41]Robert Nemiroff ([42]MTU) & [43]Jerry Bonnell
                                 ([44]UMCP)
          NASA Official: Amber Straughn [45]Specific rights apply.
            [46]NASA Web Privacy, [47]Accessibility, [48]Notices;
                A service of: [49]ASD at [50]NASA / [51]GSFC,
                         [52]NASA Science Activation
                           & [53]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2607/sibling_supernovae.jpg
   3. https://www.nasa.gov/goddard/
   4. https://kipac.stanford.edu/people/miltiadis-michailidis
   5. https://irsa.ipac.caltech.edu/data/DSS/overview.html
   6. https://www.nasa.gov/
   7. https://www.jpl.nasa.gov/missions/wide-field-infrared-survey-explorer-wise/
   8. https://www.jpl.nasa.gov/
   9. https://www.caltech.edu/
  10. https://www.ucla.edu/
  11. https://www.nasa.gov/
  12. https://science.nasa.gov/mission/swift/
  13. https://science.gsfc.nasa.gov/sci/bio/cecilia.chirenti
  14. https://www.nasa.gov/
  15. https://www.nasa.gov/goddard/
  16. https://www.astro.umd.edu/people/cecilia-chirenti
  17. https://cresst2.umd.edu/
  18. https://science.nasa.gov/universe/stars/multiple-star-systems/
  19. https://science.nasa.gov/missions/fermi/nasas-fermi-sibling-supernova-remnants/
  20. https://apod.nasa.gov/apod/ap260206.html
  21. https://apod.nasa.gov/apod/ap231226.html
  22. https://en.wikipedia.org/wiki/IC_443
  23. https://arxiv.org/pdf/2007.03226
  24. https://ui.adsabs.harvard.edu/abs/2026AAS...24743307M/abstract
  25. https://www.nasa.gov/
  26. https://science.nasa.gov/mission/fermi/
  27. https://humsci.stanford.edu/feature/researchers-uncover-evidence-sibling-supernovas
  28. https://images.unsplash.com/vector-1741055269495-7abf86aab37a
  29. https://en.wikipedia.org/wiki/Eta_Geminorum
  30. https://apod.nasa.gov/apod/ap260701.html
  31. https://apod.nasa.gov/apod/archivepix.html
  32. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  33. https://apod.nasa.gov/apod/lib/aptree.html
  34. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  35. https://apod.nasa.gov/apod/calendar/allyears.html
  36. https://apod.com/feed.rss
  37. https://apod.nasa.gov/apod/lib/edlinks.html
  38. https://apod.nasa.gov/apod/lib/about_apod.html
  39. https://asterisk.apod.com/discuss_apod.php?date=260702
  40. https://apod.nasa.gov/apod/ap260703.html
  41. https://www.mtu.edu/physics/department/faculty/nemiroff/
  42. https://www.mtu.edu/physics/
  43. https://inspirehep.net/authors/1073087
  44. http://www.astro.umd.edu/
  45. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  46. https://www.nasa.gov/about/highlights/HP_Privacy.html
  47. https://www.nasa.gov/general/accessibility/
  48. https://www.nasa.gov/privacy/
  49. https://science.gsfc.nasa.gov/astrophysics/
  50. https://www.nasa.gov/
  51. https://www.nasa.gov/centers/goddard/
  52. https://science.nasa.gov/learn/about-science-activation/
  53. http://www.mtu.edu/