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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.   
      
                                 2023 September 4   
      Red glowing gas is seen before a dark starfield. On the upper right is   
      a complicated filamentary nebula in blue and red. On the lower left is   
       a simple circular nebula in blue. Please see the explanation for more   
                               detailed information.   
      
                            Cygnus: Bubble and Crescent   
                       Credit & Copyright: Abdullah Al-Harbi   
      
      Explanation: As stars die, they create clouds. Two stellar death clouds   
      of gas and dust can be found toward the high-flying constellation of   
      the Swan (Cygnus) as they drift through rich star fields in the plane   
      of our Milky Way Galaxy. Caught here within the telescopic field of   
      view are the Soap Bubble (lower left) and the Crescent Nebula (upper   
      right). Both were formed at the final phase in the life of a star. Also   
      known as NGC 6888, the Crescent Nebula was shaped as its bright,   
      central massive Wolf-Rayet star, WR 136, shed its outer envelope in a   
      strong stellar wind. Burning through fuel at a prodigious rate, WR 136   
      is near the end of a short life that should finish in a spectacular   
      supernova explosion. Discovered in 2013, the Soap Bubble Nebula is   
      likely a planetary nebula, the final shroud of a lower mass,   
      long-lived, Sun-like star destined to become a slowly cooling white   
      dwarf. Both stellar nebulas are about 5,000 light-years distant, with   
      the larger Crescent Nebula spanning about 25 light-years across. Within   
      a few million years, both will likely have dispersed.   
      
        Your Sky Surprise: What picture did APOD feature on your birthday?   
                                    (post 1995)   
                        Tomorrow's picture: blue supermoon   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
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