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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 May 5   
      
                           NGC 3521: Galaxy in a Bubble   
               Image Credit & Copyright: Mark Hanson and Mike Selby   
      
      Explanation: Gorgeous spiral galaxy NGC 3521 is a mere 35 million   
      light-years away, toward the northern springtime constellation Leo.   
      Relatively bright in planet Earth's sky, NGC 3521 is easily visible in   
      small telescopes but often overlooked by amateur imagers in favor of   
      other Leo spiral galaxies, like M66 and M65. It's hard to overlook in   
      this colorful cosmic portrait though. Spanning some 50,000 light-years   
      the galaxy sports characteristic patchy, irregular spiral arms laced   
      with dust, pink star forming regions, and clusters of young, blue   
      stars. This deep image also finds NGC 3521 embedded in fainter,   
      gigantic, bubble-like shells. The shells are likely tidal debris,   
      streams of stars torn from satellite galaxies that have undergone   
      mergers with NGC 3521 in the distant past.   
      
                       Tomorrow's picture: southern tadpoles   
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          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
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