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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 May 7   
       Two large galaxies are shown against a dark starfield. The galaxy on   
        the upper left has blue spiral arms speckled with red nebulae. The   
       galaxy on the lower right has a white line with red filaments on each   
       side. Thin wisps cover some of the rest of the field. Please see the   
                    explanation for more detailed information.   
      
                            Galaxy Wars: M81 versus M82   
        Image Credit & Copyright: Collaborative Astrophotography Team (CAT)   
      
      Explanation: In the upper left corner, surrounded by blue arms and   
      dotted with red nebulas, is spiral galaxy M81. In the lower right   
      corner, marked by a light central line and surrounded by red glowing   
      gas, is irregular galaxy M82. This stunning vista shows these two   
      mammoth galaxies locked in gravitational combat, as they have been for   
      the past billion years. The gravity from each galaxy dramatically   
      affects the other during each hundred-million-year pass. Last go-round,   
      M82's gravity likely raised density waves rippling around M81,   
      resulting in the richness of M81's spiral arms. But M81 left M82 with   
      violent star forming regions and colliding gas clouds so energetic the   
      galaxy glows in X-rays. This big battle is seen from Earth through the   
      faint glow of an Integrated Flux Nebula, a little studied complex of   
      diffuse gas and dust clouds in our Milky Way Galaxy. In a few billion   
      years, only one galaxy will remain.   
      
                       Tomorrow's picture: incredible crab 1   
        __________________________________________________________________   
      
          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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