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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 September 26   
      
                      The Great Globular Cluster in Hercules   
       Image Credit & Copyright: Jan Beckmann, Julian Zoller, Lukas Eisert,   
                                  Wolfgang Hummel   
      
      Explanation: In 1716, English astronomer Edmond Halley noted, "This is   
      but a little Patch, but it shows itself to the naked Eye, when the Sky   
      is serene and the Moon absent." Of course, M13 is now less modestly   
      recognized as the Great Globular Cluster in Hercules, one of the   
      brightest globular star clusters in the northern sky. Sharp telescopic   
      views like this one reveal the spectacular cluster's hundreds of   
      thousands of stars. At a distance of 25,000 light-years, the cluster   
      stars crowd into a region 150 light-years in diameter. Approaching the   
      cluster core, upwards of 100 stars could be contained in a cube just 3   
      light-years on a side. For comparison, the closest star to the Sun is   
      over 4 light-years away. The deep, wide-field image also reveals   
      distant background galaxies including NGC 6207 at the upper left, and   
      faint, foreground Milky Way dust clouds known to some as integrated   
      flux nebulae.   
      
                     Tomorrow's picture: in the local universe   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
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                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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