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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 2   
      The featured image shows the surface of the Sun with a flowing texture   
      in red light. Above the Sun's surface an unusual triangular prominence   
         hovers. Please see the explanation for more detailed information.   
      
                    A Triangular Prominence Hovers Over the Sun   
                      Image Credit & Copyright: Andrea Vanoni   
      
      Explanation: Why is there a triangle hovering over the Sun? Although   
      the shape is unusual, the type of structure is not: it is part of an   
      evolving solar prominence. Looping magnetic fields on the Sun channel   
      the flow of energetic particles, sometimes holding glowing gaseous   
      structures aloft for months. A prominence glows brightly because it   
      contains particularly hot, dense, or opaque solar plasma. The   
      surprising triangular structure occurred last week. Larger than our   
      Earth, the iconic prominence was imaged by several solar photographers   
      and documented by NASA's Solar Dynamic Observatory to form and   
      violently dissipate in about a day. The featured image was captured in   
      a color of red light emitted strongly by hydrogen. Below, solar fibrils   
      carpet the Sun's chromosphere, while the background sky is so faint in   
      comparison that no stars are visible. Our Sun's surface has been quite   
      active this year.   
      
                         Tomorrow's picture: Moon sisters   
        __________________________________________________________________   
      
          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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