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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.   
      
                                 2024 September 18   
      A starfield is shown with a long blue-glowing nebula taking up much of   
      the frame. The nebula appears, to some, similar to a fish or a mermaid.   
             Please see the explanation for more detailed information.   
      
                       The Mermaid Nebula Supernova Remnant   
       Image Credit & Copyright: Neil Corke; Text: Natalia Lewandowska (SUNY   
                                      Oswego)   
      
      Explanation: New stars are born from the remnants of dead stars. The   
      gaseous remnant of the gravitational collapse and subsequent death of a   
      very massive star in our Milky Way created the G296.5+10.0 supernova   
      remnant, of which the featured Mermaid Nebula is part. Also known as   
      the Betta Fish Nebula, the Mermaid Nebula makes up part of an unusual   
      subclass of supernova remnants that are two-sided and nearly circular.   
      Originally discovered in X-rays, the filamentary nebula is a frequently   
      studied source also in radio and gamma-ray light. The blue color   
      visible here originates from doubly ionized oxygen (OIII), while the   
      deep red is emitted by hydrogen gas. The nebula's mermaid-like shape   
      has proven to be useful for measurements of the interstellar magnetic   
      field.   
      
                          Tomorrow's picture: open space   
        __________________________________________________________________   
      
          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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