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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 January 19   
      
                             M31: The Andromeda Galaxy   
           Image Credit: Subaru (NAOJ), Hubble (NASA/ESA), Mayall (NSF);   
                  Processing & Copyright: R. Gendler & R. Croman   
      
      Explanation: The most distant object easily visible to the unaided eye   
      is M31, the great Andromeda Galaxy. Even at some two and a half million   
      light-years distant, this immense spiral galaxy -- spanning over   
      200,000 light years -- is visible, although as a faint, nebulous cloud   
      in the constellation Andromeda. In contrast, a bright yellow nucleus,   
      dark winding dust lanes, and expansive spiral arms dotted with blue   
      star clusters and red nebulae, are recorded in this stunning telescopic   
      image which combines data from orbiting Hubble with ground-based images   
      from Subaru and Mayall. In only about 5 billion years, the Andromeda   
      galaxy may be even easier to see -- as it will likely span the entire   
      night sky -- just before it merges with our Milky Way Galaxy.   
      
                          Tomorrow's picture: open space   
        __________________________________________________________________   
      
          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   
                                & Michigan Tech. U.   
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