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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.   
      
                                 2022 September 14   
      
                         Waves of the Great Lacerta Nebula   
         Image Credit & Copyright: Jarmo Ruuth, Telescope Live; Text: Ata   
            Sarajedini (Florida Atlantic U., Astronomy Minute podcast)   
      
      Explanation: It is one of the largest nebulas on the sky -- why isn't   
      it better known? Roughly the same angular size as the Andromeda Galaxy,   
      the Great Lacerta Nebula can be found toward the constellation of the   
      Lizard (Lacerta). The emission nebula is difficult to see with   
      wide-field binoculars because it is so faint, but also usually   
      difficult to see with a large telescope because it is so great in angle   
      -- spanning about three degrees. The depth, breadth, waves, and beauty   
      of the nebula -- cataloged as Sharpless 126 (Sh2-126) -- can best be   
      seen and appreciated with a long duration camera exposure. The featured   
      image is one such combined exposure -- in this case 10 hours over five   
      different colors and over six nights during this past June and July at   
      the IC Astronomy Observatory in Spain. The hydrogen gas in the Great   
      Lacerta Nebula glows red because it is excited by light from the bright   
      star 10 Lacertae, one of the bright blue stars just above the   
      red-glowing nebula's center. The stars and nebula are about 1,200 light   
      years distant.   
      
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