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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 March 22   
      The Andromeda Galaxy is shown in great detail. Red nebulas, blue stars,   
         and dark dust are all seen in a swirl around the galaxy's bright   
         center. Please see the explanation for more detailed information.   
      
                             M31: The Andromeda Galaxy   
                    Image Credit & Copyright: Abdullah Al-Harbi   
      
      Explanation: How far can you see? The most distant object easily   
      visible to the unaided eye is M31, the great Andromeda Galaxy, over two   
      million light-years away. Without a telescope, even this immense spiral   
      galaxy appears as an unremarkable, faint, nebulous cloud in the   
      constellation Andromeda. But a bright white nucleus, dark winding dust   
      lanes, luminous blue spiral arms, and bright red emission nebulas are   
      recorded in this stunning fifteen-hour telescopic digital mosaic of our   
      closest major galactic neighbor. But how do we know this spiral nebula   
      is really so far away? This question was central to the famous   
      Shapley-Curtis debate of 1920. M31's great distance was determined in   
      the 1920s by observations that resolved individual stars that changed   
      their brightness in a way that gave up their true distance. The result   
      proved that Andromeda is just like our Milky Way Galaxy -- a conclusion   
      making the rest of the universe much more vast than had ever been   
      previously imagined.   
      
                          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,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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