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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 December 13   
        A starfield is shown filled with colorful gas glowing in different   
        colors, and dark dust. Please see the explanation for more detailed   
                                   information.   
      
                           Deep Field: The Heart Nebula   
             Image Credit & Copyright: William Ostling, Telescope Live   
      
      Explanation: What excites the Heart Nebula? First, the large emission   
      nebula on the left, catalogued as IC 1805, looks somewhat like a human   
      heart. The nebula glows brightly in red light emitted by its most   
      prominent element, hydrogen, but this long-exposure image was also   
      blended with light emitted by silicon (yellow) and oxygen (blue). In   
      the center of the Heart Nebula are young stars from the open star   
      cluster Melotte 15 that are eroding away several picturesque dust   
      pillars with their atom-exciting energetic light and winds. The Heart   
      Nebula is located about 7,500 light years away toward the constellation   
      of Cassiopeia. At the bottom right of the Heart Nebula is the companion   
      Fishhead Nebula. This wide and deep image clearly shows, though, that   
      glowing gas surrounds the Heart Nebula in all directions.   
      
                          Tomorrow's picture: open space   
        __________________________________________________________________   
      
          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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