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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 January 8   
      A star field appears that has several nebulas. Toward the upper left is   
      a angularly small supernova remnant colored blue, while dominating the   
       lower right is a large supernova remnant in both red and blue. Please   
                see the explanation for more detailed information.   
      
                         Supernova Remnants Big and Small   
             Image Credit & Copyright: St+¬phane Vetter (Nuits sacr+¬es)   
      
      Explanation: What happens after a star explodes? A huge fireball of hot   
      gas shoots out in all directions. When this gas slams into the existing   
      interstellar medium, it heats up so much it glows. Two different   
      supernova remnants (SNRs) are visible in the featured image, taken at   
      the Ouka+»meden Observatory in Morocco. The blue soccer ball-looking   
      nebula toward the upper left is SNR G179.0+02.6, which appears to be   
      the smaller one. This supernova, about 11,000 light years distant,   
      detonated about 50,000 years ago. Although composed mostly of hydrogen   
      gas, the blue light is emitted by a trace amount of oxygen. The   
      seemingly larger SNR, dominating the lower right of the frame, is the   
      Spaghetti Nebula, cataloged as Simeis 147 and sh2-240. This supernova,   
      only about 3,000 light years away, exploded about 40,000 years ago.   
      Comparatively, even though they appear different sizes, both supernova   
      remnants are not only roughly the same age, but about the same size,   
      too.   
      
                          Tomorrow's picture: open space   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Amber Straughn Specific rights apply.   
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                                & Michigan Tech. U.   
      
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