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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 December 16   
      
                                Crescent Enceladus   
              Image Credit: Cassini Imaging Team, SSI, JPL, ESA, NASA   
      
      Explanation: Peering from the shadows, the Saturn-facing hemisphere of   
      tantalizing inner moon Enceladus poses in this Cassini spacecraft   
      image. North is up in the dramatic scene captured during November 2016   
      as Cassini's camera was pointed in a nearly sunward direction about   
      130,000 kilometers from the moon's bright crescent. In fact, the   
      distant world reflects over 90 percent of the sunlight it receives,   
      giving its surface about the same reflectivity as fresh snow. A mere   
      500 kilometers in diameter, Enceladus is a surprisingly active moon.   
      Data and images collected during Cassini's flybys have revealed water   
      vapor and ice grains spewing from south polar geysers and evidence of   
      an ocean of liquid water hidden beneath the moon's icy crust.   
      
                        Tomorrow's picture: the same color   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
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                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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