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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 March 17   
        The image shows a starfield with an oval shaped red and light-blue   
          tinged nebula in the center Please see the explanation for more   
                               detailed information.   
      
                                   Thor's Helmet   
          Image Credit & Copyright: Brian Hopkins (East Coast Astronomer)   
      
      Explanation: Thor not only has his own day (Thursday), but a helmet in   
      the heavens. Popularly called Thor's Helmet, NGC 2359 is a hat-shaped   
      cosmic cloud with wing-like appendages. Heroically sized even for a   
      Norse god, Thor's Helmet is about 30 light-years across. In fact, the   
      cosmic head-covering is more like an interstellar bubble, blown by a   
      fast wind from the bright, massive star near the bubble's center. Known   
      as a Wolf-Rayet star, the central star is an extremely hot giant   
      thought to be in a brief, pre-supernova stage of evolution. NGC 2359 is   
      located about 15,000 light-years away toward the constellation of the   
      Great Overdog. This sharp image is a mixed cocktail of data from   
      narrowband filters, capturing not only natural looking stars but   
      details of the nebula's filamentary structures. The star in the center   
      of Thor's Helmet is expected to explode in a spectacular supernova   
      sometime within the next few thousand years.   
      
                          Tomorrow's picture: sky danger   
        __________________________________________________________________   
      
          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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