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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 19   
      
                        Long Shadows of the Montes Caucasus   
                       Image Credit & Copyright: Guy Bardon   
      
      Explanation: When the Moon is at its first quarter phase, the Sun rises   
      along the Montes Caucasus as seen from the lunar surface. The lunar   
      mountain range casts the magnificent, spire-like shadows in this   
      telescopic view from planet Earth, looking along the lunar terminator   
      or the boundary between lunar night and day. Named for Earth's own   
      Caucasus Mountains, the rugged lunar Montes Caucasus peaks, up to 6   
      kilometers high, are located between the smooth Mare Imbrium to the   
      west and Mare Serenitatis to the east. Still mostly in shadow in this   
      first quarter lunarscape, at the left (west) impact craters reflect the   
      light of the rising Sun along their outer, eastern crater walls.   
      
                       Tomorrow's picture: the Sun's tattoo   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Amber Straughn Specific rights apply.   
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                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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