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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 November 21   
        A nebula consisting of blue and red wisps starts thin at the image   
        bottom but expands into a triangle at the image top. Please see the   
                    explanation for more detailed information.   
      
                             Fleming's Triangular Wisp   
                    Image Credit & Copyright: Cristiano Gualco   
      
      Explanation: These chaotic and tangled filaments of shocked, glowing   
      gas are spread across planet Earth's sky toward the constellation of   
      Cygnus as part of the Veil Nebula. The Veil Nebula itself is a large   
      supernova remnant, an expanding cloud born of the death explosion of a   
      massive star. Light from the original supernova explosion likely   
      reached Earth over 5,000 years ago. The glowing filaments are really   
      more like long ripples in a sheet seen almost edge on, remarkably well   
      separated into the glow of ionized hydrogen atoms shown in red and   
      oxygen in blue hues. Also known as the Cygnus Loop and cataloged as NGC   
      6979, the Veil Nebula now spans about 6 times the diameter of the full   
      Moon. The length of the wisp corresponds to about 30 light years, given   
      its estimated distance of 2,400 light years. Often identified as   
      Pickering's Triangle for a director of Harvard College Observatory, it   
      is perhaps better named for its discoverer, astronomer Williamina   
      Fleming, as Fleming's Triangular Wisp.   
      
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