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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.   
      
                                 2025 December 31   
      A starfield filled with a diffuse red glow has an unusual nebula on the   
        lower left. The nebula has bright red filaments that curve down and   
         appear to be reminiscent of a waterfall on Earth. Please see the   
                    explanation for more detailed information.   
      
                           HH-222: The Waterfall Nebula   
                       Image Credit & Copyright: Mike Selby   
      
      Explanation: What created the Waterfall Nebula? The origin is still   
      being researched. The structure, officially designated Herbig-Haro 222,   
      appears in the region of NGC 1999 in the Great Orion Molecular Cloud   
      complex. The elongated gaseous stream stretches about ten light years   
      but appears similar to a long waterfall on Earth. Recent observations   
      indicate that HH-222 is likely a gigantic gaseous bow shock, similar to   
      a wave of water caused by a fast-moving ship. The origin of this shock   
      wave is thought to be a jet outflow from the multiple star system V380   
      Orionis off the lower left of the frame. Therefore, gas does not flow   
      along the waterfall, but rather the entire structure moves toward the   
      upper right. The Waterfall Nebula lies about 1,500 light years away   
      toward the constellation of Orion. The featured image was captured   
      earlier this month from El Sauce Observatory in Chile.   
      
                    Jigsaw Nebula: Astronomy Puzzle of the Day   
                          Tomorrow's picture: open space   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
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