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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 December 10   
      
                               The Horsehead Nebula   
                  Image Credit & Copyright: George Chatzifrantzis   
      
      Explanation: Sculpted by stellar winds and radiation, this dusty   
      interstellar molecular cloud has by chance has assumed an immediately   
      recognizable shape. Fittingly known as The Horsehead Nebula, it lies   
      some 1,500 light-years distant, embedded in the vast Orion cloud   
      complex. About five light-years "tall," the dark cloud is cataloged as   
      Barnard 33, first identified on a photographic plate taken in the late   
      19th century. B33 is visible primarily because its obscuring dust is   
      silhouetted against the glow of emission nebula IC 434. Hubble space   
      telescope images from the early 21st century find young stars forming   
      within B33. Of course, the magnificent interstellar cloud will slowly   
      shift its apparent shape over the next few million years. But for now   
      the Horsehead Nebula is a rewarding though difficult object to view   
      with small telescopes from planet Earth.   
      
                    Tomorrow's picture: the spectrum of the Sun   
        __________________________________________________________________   
      
          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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