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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 April 24   
          A nearly spherical but stringy nebula is shown against a starry   
          background. The nebula is colored blue and red. Please see the   
                    explanation for more detailed information.   
      
                       The Medulla Nebula Supernova Remnant   
                    Image Credit & Copyright: Kimberly Sibbald   
      
      Explanation: What powers this unusual nebula? CTB-1 is the expanding   
      gas shell that was left when a massive star toward the constellation of   
      Cassiopeia exploded about 10,000 years ago. The star likely detonated   
      when it ran out of elements near its core that could create stabilizing   
      pressure with nuclear fusion. The resulting supernova remnant,   
      nicknamed the Medulla Nebula for its brain-like shape, still glows in   
      visible light by the heat generated by its collision with confining   
      interstellar gas. Why the nebula also glows in X-ray light, though,   
      remains a mystery. One hypothesis holds that an energetic pulsar was   
      co-created that powers the nebula with a fast outwardly moving wind.   
      Following this lead, a pulsar has recently been found in radio waves   
      that appears to have been expelled by the supernova explosion at over   
      1000 kilometers per second. Although the Medulla Nebula appears as   
      large as a full moon, it is so faint that it took many hours of   
      exposure with a telescope in Seven Persons, Alberta, Canada to create   
      the featured image.   
      
                        Tomorrow's picture: lunar triomuphe   
        __________________________________________________________________   
      
          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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