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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 November 22   
      The featured image shows two clusters of blue stars placed next to each   
         other. Please see the explanation for more detailed information.   
      
                         A Double Star Cluster in Perseus   
                       Image Credit & Copyright: Tommy Lease   
      
      Explanation: Few star clusters this close to each other. Visible to the   
      unaided eye from dark sky areas, it was cataloged in 130 BC by Greek   
      astronomer Hipparchus. Some 7,000 light-years away, this pair of open   
      star clusters is also an easy binocular target, a striking starfield in   
      the northern constellation of the mythical Greek hero Perseus. Now   
      known as h and chi Persei, or NGC 869 (above right) and NGC 884, the   
      clusters themselves are separated by only a few hundred light-years and   
      contain stars much younger and hotter than the Sun. In addition to   
      being physically close together, the clusters' ages based on their   
      individual stars are similar - evidence that both clusters were likely   
      a product of the same star-forming region.   
      
                          Tomorrow's picture: open space   
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          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
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                                & Michigan Tech. U.   
      
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