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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.   
      
                                   2022 August 4   
      
                    M13: The Great Globular Cluster in Hercules   
                Image Credit & Copyright: Joan Josep Isach Cogollos   
      
      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 remarkable range of brightness recorded in   
      this image follows stars into the dense cluster core. Distant   
      background galaxies in the medium-wide field of view include NGC 6207   
      at the upper left.   
      
                      Tomorrow's picture: A Beautiful Trifid   
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          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
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