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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 September 2   
       A starfield is shown with bright and dark nebulae of different shapes   
       and colors. Please see the explanation for more detailed information.   
      
                          The Horsehead and Flame Nebulas   
                      Image Credit & Copyright: Daniel Stern   
      
      Explanation: The Horsehead Nebula is one of the most famous nebulae on   
      the sky. It is visible as the dark indentation to the orange emission   
      nebula at the far right of the featured picture. The horse-head feature   
      is dark because it is really an opaque dust cloud that lies in front of   
      the bright emission nebula. Like clouds in Earth's atmosphere, this   
      cosmic cloud has assumed a recognizable shape by chance. After many   
      thousands of years, the internal motions of the cloud will surely alter   
      its appearance. The emission nebula's orange color is caused by   
      electrons recombining with protons to form hydrogen atoms. Toward the   
      lower left of the image is the Flame Nebula, an orange-tinged nebula   
      that also contains intricate filaments of dark dust.   
      
                           Tomorrow's picture: star jet   
        __________________________________________________________________   
      
          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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