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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 November 24   
         A starfield has a large and unusual red and orange nebula in the   
        middle. The nebula seems to contain not only swirls but also nearly   
         transparent shells. Please see the explanation for more detailed   
                                   information.   
      
                        Apep: Unusual Dust Shells from Webb   
       Image Credit: NASA, ESA, CSA, STScI, JWST; Science: Y. Han (Caltech),   
            R. White (Macquarie U.); Image Processing: A. Pagan (STScI)   
      
      Explanation: What created this unusual space sculpture? Stars. This   
      unusual system of swirls and shells, known as Apep, was observed in   
      unprecedented detail by NASACÇÖs James Webb Space Telescope in infrared   
      light in 2024. Observations indicate that the unusual shape originates   
      from two massive Wolf-Rayet stars orbiting each other every 190 years   
      with each close passes causing a new shell of dust and gas to be   
      expelled. Holes in these shells are thought to be caused by a third   
      orbiting star. This stellar dust dance will likely continue for   
      hundreds of thousands of years, possibly ending only when one of the   
      massive stars runs out of internal nuclear fuel and explodes in a   
      supernova punctuated by a burst of gamma-rays.   
      
              Build your own star system: Astronomy Puzzle of the Day   
                       Tomorrow's picture: picturesque comet   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Amber Straughn Specific rights apply.   
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