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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 May 23   
      
                      The Once and Future Stars of Andromeda   
       Image Credit: NASA, NSF, NOAJ, Hubble, Subaru, Mayall, DSS, Spitzer;   
              Processing & Copyright: Robert Gendler & Russell Croman   
      
      Explanation: This picture of Andromeda shows not only where stars are   
      now, but where stars will soon be. Of course, the big, beautiful   
      Andromeda Galaxy, M31, is a spiral galaxy -- and a mere 2.5 million   
      light-years away. Both space-based and ground-based observatories have   
      been here combined to produce this intriguing composite image of   
      Andromeda, at wavelengths both inside and outside normally visible   
      light. The visible light shows where M31's stars are now -- as   
      highlighted in white and blue hues and imaged by the Hubble, Subaru,   
      and Mayall telescopes. The infrared light shows where M31's future   
      stars will soon form -- as highlighted in orange hues and imaged by   
      NASA's Spitzer Space Telescope. The infrared light tracks enormous   
      lanes of dust, warmed by stars, sweeping along Andromeda's spiral arms.   
      This dust is a tracer of the galaxy's vast interstellar gas -- the raw   
      material for future star formation. These new stars will likely form   
      over the next hundred million years, surely well before Andromeda   
      merges with our Milky Way Galaxy in about 5 billion years.   
      
                         Tomorrow's picture: visiting moon   
        __________________________________________________________________   
      
          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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