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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.   
      
                                  2022 November 9   
       The featured image shows a complex nebula that is more dense and more   
       blue on one side than the other. Please see the explanation for more   
                               detailed information.   
      
               The Asymmetric Nebula Surrounding Wolf-Rayet Star 18   
                      Image Credit & Copyright: Alex Woronow   
      
      Explanation: Why does the nebula around the star WR-18 shine brighter   
      on one side? Also known as NGC 3199, this active star and its   
      surrounding nebula lie about 12,000 light-years away toward the   
      nautical southern constellation of Carina. The featured deep image has   
      been highly processed to bring out filamentary details of the glowing   
      gas in the bubble-shaped nebula. The nebula is about 75 light-years   
      across. Near the nebula's center is a Wolf-Rayet star, WR-18, which is   
      a massive, hot, short-lived star that generates an intense and complex   
      stellar wind. In fact, Wolf-Rayet stars are known to create nebulas   
      with interesting shapes as their powerful winds sweep up surrounding   
      interstellar material. In this case, the bright right edge was   
      initially thought to indicate that a bow shock was being produced as   
      the star plowed through a uniform medium, like a boat through water.   
      Recent measurements and analyses, however, have shown the star is not   
      moving quickly toward the bright edge. A more likely explanation has   
      emerged that the material surrounding the star is not uniform, but   
      clumped and denser near the bright edge.   
      
                          Tomorrow's picture: open space   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
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                                & Michigan Tech. U.   
      
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