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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.   
      
                                 2023 February 23   
      
                         Arp 78: Peculiar Galaxy in Aries   
                      Image Credit & Copyright: Josep Drudis   
      
      Explanation: Peculiar spiral galaxy Arp 78 is found within the   
      boundaries of the head strong constellation Aries. Some 100 million   
      light-years beyond the stars and nebulae of our Milky Way galaxy, the   
      island universe is an enormous 200,000 light-years across. Also known   
      as NGC 772, it sports a prominent, outer spiral arm in this detailed   
      cosmic portrait. Tracking along sweeping dust lanes and lined with   
      young blue star clusters, Arp 78's overdeveloped spiral arm is   
      pumped-up by galactic-scale gravitational tides. Interactions with its   
      brightest companion galaxy, the more compact NGC 770 seen above and   
      right of the larger spiral, are likely responsible. Embedded in faint   
      star streams revealed in the deep telescopic exposure, NGC 770's fuzzy,   
      elliptical appearance contrasts nicely with spiky foreground Milky Way   
      stars in matching yellowish hues.   
      
                    Tomorrow's picture: beyond Jones-Emberson 1   
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