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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 October 18   
      Brown glowing dust appears to the left of the blue and red filamentary   
        gas that composes the western edge of the Veil Nebula, a supernova   
        remnant. Please see the explanation for more detailed information.   
      
                         Dust and the Western Veil Nebula   
                        Image Credit & Copyright: Jiang Wu   
      
      Explanation: It's so big it is easy to miss. The entire Veil Nebula   
      spans six times the diameter of the full moon, but is so dim you need   
      binoculars to see it. The nebula was created about 15,000 years ago   
      when a star in the constellation of the Swan (Cygnus) exploded. The   
      spectacular explosion would have appeared brighter than even Venus for   
      a week - but there is no known record of it. Pictured is the western   
      edge of the still-expanding gas cloud. Notable gas filaments include   
      the Witch's Broom Nebula on the upper left near the bright foreground   
      star 52 Cygni, and Fleming's Triangular Wisp (formerly known as   
      Pickering's Triangle) running diagonally up the image middle. What is   
      rarely imaged -- but seen in the featured long exposure across many   
      color bands -- is the reflecting brown dust that runs vertically up the   
      image left, dust likely created in the cool atmospheres of massive   
      stars.   
      
                          Tomorrow's picture: open space   
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          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
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