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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.   
      
                                  2021 December 8   
      
                       Comet Hale-Bopp Over Val Parola Pass   
            Image Credit & Copyright: A. Dimai, (Col Druscie Obs.), AAC   
      
      Explanation: Comet Hale-Bopp, the Great Comet of 1997, became much   
      brighter than any surrounding stars. It was seen even over bright city   
      lights. Away from city lights, however, it put on quite a spectacular   
      show. Here Comet Hale-Bopp was photographed above Val Parola Pass in   
      the Dolomite mountains surrounding Cortina d'Ampezzo, Italy. Comet   
      Hale-Bopp's blue ion tail, consisting of ions from the comet's nucleus,   
      is pushed out by the solar wind. The white dust tail is composed of   
      larger particles of dust from the nucleus driven by the pressure of   
      sunlight, that orbit behind the comet. Comet Hale-Bopp (C/1995 O1)   
      remained visible to the unaided eye for 18 months -- longer than any   
      other comet in recorded history. The large comet is next expected to   
      return around the year 4385. This month, Comet Leonard is brightening   
      and may soon become visible to the unaided eye.   
      
                          Tomorrow's picture: open space   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
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                                & Michigan Tech. U.   
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