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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.   
      
                                 2025 February 21   
      
                         Hubble's Andromeda Galaxy Mosaic   
                     Image Credit: NASA, ESA, Hubble Mission,   
        B. F. Williams (Univ Washington), Z. Chen (Univ Washington), L. C.   
                              Johnson (Northwestern),   
                       Processing; Joseph DePasquale (STScI)   
      
      Explanation: The largest photomosaic ever assembled from Hubble Space   
      Telescope image data is a panoramic view of our neighboring spiral   
      Andromeda Galaxy. With 600 overlapping frames assembled from   
      observations made from July 2010 to December 2022, the full Hubble   
      Andromeda Galaxy mosaic spans almost six full moons across planet   
      Earth's sky. A cropped version shown above is nearly two full moons   
      across and partially covers Andromeda's core and inner spiral arms.   
      Also known as M31, the Andromeda Galaxy is 2.5 million light-years   
      away. That makes it the closest large spiral galaxy to our own Milky   
      Way. Our perspective on the spiral Milky Way is anchored to the view   
      from the location of the Sun, a star found within the Milky Way's   
      galactic disk. But Hubble's magnificent Andromeda mosaic offers an   
      expansive view of a large spiral galaxy from the outside looking in.   
      Hubble's comprehensive, detailed data set extending across the   
      Andromeda Galaxy will allow astronomers to make an unprecedented   
      holistic exploration of the mysteries of spiral galaxy structure and   
      evolution.   
      
                         Tomorrow's picture: light-weekend   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Amber Straughn Specific rights apply.   
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                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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