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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 September 10   
       A starfield surrounds a large red nebula. The nebula has many flowing   
           waves and folds. Please see the explanation for more detailed   
                                   information.   
      
                             The Great Lacerta Nebula   
              Image Credit & Copyright: Ian Moehring & Kevin Roylance   
      
      Explanation: It is one of the largest nebulas on the sky -- why isn't   
      it better known? Roughly the same angular size as the Andromeda Galaxy,   
      the Great Lacerta Nebula can be found toward the constellation of the   
      Lizard (Lacerta). The emission nebula is difficult to see with   
      wide-field binoculars because it is so faint, but also usually   
      difficult to see with a large telescope because it is so great in angle   
      -- spanning about three degrees. The depth, breadth, waves, and beauty   
      of the nebula -- cataloged as Sharpless 126 (Sh2-126) -- can best be   
      seen and appreciated with a long duration camera exposure. The featured   
      image is one such combined exposure -- in this case taken over three   
      nights in August through dark skies in Moses Lake, Washington, USA. The   
      hydrogen gas in the Great Lacerta Nebula glows red because it is   
      excited by light from the bright star 10 Lacertae, one of the bright   
      blue stars just to the left of the red-glowing nebula's center. Most of   
      the stars and nebula are about 1,200 light years distant.   
      
                   Jigsaw Universe: Astronomy Puzzle of the Day   
                          Tomorrow's picture: shadow play   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Amber Straughn Specific rights apply.   
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                                & Michigan Tech. U.   
      
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