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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 January 23   
      Two spiral galaxies are shown right next to each other, with a smaller   
       distorted galaxy on the far left. Please see the explanation for more   
                               detailed information.   
      
                     The Colliding Spiral Galaxies of Arp 274   
       Image Credit: NASA, ESA, Hubble; Processing & Copyright: Mehmet Hakan   
                                       .zsarat   
      
      Explanation: Two galaxies are squaring off in Virgo and here are the   
      latest pictures. When two galaxies collide, the stars that compose them   
      usually do not. This is because galaxies are mostly empty space and,   
      however bright, stars only take up only a small fraction of that space.   
      But during the collision, one galaxy can rip the other apart   
      gravitationally, and dust and gas common to both galaxies does collide.   
      If the two galaxies merge, black holes that likely resided in each   
      galaxy center may eventually merge. Because the distances are so large,   
      the whole thing takes place in slow motion -- over hundreds of millions   
      of years. Besides the two large spiral galaxies, a smaller third galaxy   
      is visible on the far left of the featured image of Arp 274, also known   
      as NGC 5679. Arp 274 spans about 200,000 light years across and lies   
      about 400 million light years away toward the constellation of Virgo.   
      
       Night Sky Network webinar: APOD editor to review best space images of   
                                       2022   
                         Tomorrow's picture: a world away   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
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                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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