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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 17   
       A starfield surrounds a several large nebulas that appear mostly red   
      but also white and blue. Dark dust and blue filaments also populate the   
         frame. Please see the explanation for more detailed information.   
      
                        Nebulas and Clusters in Sagittarius   
        Image Credit & Copyright: J. De Winter, C. Humbert, C. Robert & V.   
                         Sabet; Text: Ogetay Kayali (MTU)   
      
      Explanation: Can you spot famous celestial objects in this image?   
      18th-century astronomer Charles Messier cataloged only two of them: the   
      bright Lagoon Nebula (M8) at the bottom, and the colorful Trifid Nebula   
      (M20) at the upper right. The one on the left that resembles a cat's   
      paw is NGC 6559, and it is much fainter than the other two. Even harder   
      to spot are the thin blue filaments on the left, from supernova remnant   
      (SNR G007.5-01.7). Their glow comes from small amounts of glowing   
      oxygen atoms that are so faint that it took over 17 hours of exposure   
      with just one blue color to bring up. Framing this scene of stellar   
      birth and death are two star clusters: the open cluster M21 just above   
      Trifid, and the globular cluster NGC 6544 at lower left.   
      
                           Tomorrow's picture: NGC 6914   
        __________________________________________________________________   
      
          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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