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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 November 7   
      
                             Shell Galaxies in Pisces   
                     Image Credit & Copyright: George Williams   
      
      Explanation: This spectacular intergalactic skyscape features Arp 227,   
      a curious system of galaxies from the 1966 Atlas of Peculiar Galaxies.   
      Some 100 million light-years distant within the boundaries of the   
      constellation Pisces, Arp 227 consists of the two galaxies prominent   
      above and left of center, the shell galaxy NGC 474 and its blue,   
      spiral-armed neighbor NGC 470. The readily apparent shells and star   
      streams of NGC 474 are likely tidal features originating from the   
      accretion of another smaller galaxy during close gravitational   
      encounters that began over a billion years ago. The large galaxy on the   
      bottom righthand side of the deep image, NGC 467, appears to be   
      surrounded by faint shells and streams too, evidence of another merging   
      galaxy system. Intriguing background galaxies are scattered around the   
      field that also includes spiky foreground stars. Of course, those stars   
      lie well within our own Milky Way Galaxy. The telescopic field of view   
      spans 25 arc minutes or just under 1/2 degree on the sky.   
      
                        Tomorrow's picture: pixels in space   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
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