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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 October 7   
       The featured image shows M31, the Andromeda Galaxy, in both infrared   
         light, colored orange, and visible light, colored white and blue.   
             Please see the explanation for more detailed information.   
      
                      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 be. The big, beautiful Andromeda Galaxy, M31,   
      is a spiral galaxy a mere 2.5 million light-years away. Image data from   
      space-based and ground-based observatories have been combined here to   
      produce this intriguing composite view of Andromeda at wavelengths both   
      inside and outside normally visible light. The visible light shows   
      where M31's stars are now, 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, 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, raw material for future star formation. Of course,   
      the new stars will likely form over the next hundred million years or   
      so. That's well before Andromeda merges with our Milky Way Galaxy in   
      about 5 billion years.   
      
                      Tomorrow's picture: in front of the Sun   
        __________________________________________________________________   
      
          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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