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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.   
      
                                 2024 November 12   
         A starfield is shown with a unusual textured nebula in the center   
      colored in brown with blue trimmings. Diffuse red nebula appear around   
        the edges. In the center is an opaque brown object. Please see the   
                    explanation for more detailed information.   
      
                           NGC 6888: The Crescent Nebula   
                        Image Credit & Copyright: Team ARO   
      
      Explanation: How was the Crescent Nebula created? Looking like an   
      emerging space cocoon, the Crescent Nebula, visible in the center of   
      the featured image, was created by the brightest star in its center. A   
      leading progenitor hypothesis has the Crescent Nebula beginning to form   
      about 250,000 years ago. At that time, the massive central star had   
      evolved to become a Wolf-Rayet star (WR 136), shedding its outer   
      envelope in a strong stellar wind, ejecting the equivalent of our Sun's   
      mass every 10,000 years. This wind impacted surrounding gas left over   
      from a previous phase, compacting it into a series of complex shells,   
      and lighting it up. The Crescent Nebula, also known as NGC 6888, lies   
      about 4,700 light-years away in the constellation of Cygnus. Star WR   
      136 will probably undergo a supernova explosion sometime in the next   
      million years.   
      
                   Jigsaw Challenge: Astronomy Puzzle of the Day   
                          Tomorrow's picture: open 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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