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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 July 19   
      
                                     Messier 6   
                        Image Credit & Copyright: Xinran Li   
      
      Explanation: The sixth object in Charles Messier's famous catalog of   
      things which are not comets, Messier 6 is a galactic or open star   
      cluster. A gathering of 100 stars or so, all around 100 million years   
      young, M6 lies some 1,600 light-years away toward the central Milky Way   
      in the constellation Scorpius. Also cataloged as NGC 6405, the pretty   
      star cluster's outline suggests its popular moniker, the Butterfly   
      Cluster. Surrounded by diffuse reddish emission from the region's   
      hydrogen gas the cluster's mostly hot and therefore blue stars are near   
      the center of this colorful cosmic snapshot. But the brightest cluster   
      member is a cool K-type giant star. Designated BM Scorpii it shines   
      with a yellow-orange hue, seen near the end of one of the butterfly's   
      antennae. This telescopic field of view spans nearly 2 Full Moons on   
      the sky. That's 25 light-years at the estimated distance of Messier 6.   
      
                         Tomorrow's picture: light-weekend   
        __________________________________________________________________   
      
          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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