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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 September 22   
      
                               Cosmos in Reflection   
                     Image Credit & Copyright: Jeff Dai (TWAN)   
      
      Explanation: During the day, over 12,000 large mirrors reflect sunlight   
      at the 100-megawatt, molten-salt, solar thermal power plant at the   
      western edge of the Gobi desert near Dunhuang, Gansu Province, China.   
      Individual mirror panels turn to track the sun like sunflowers. They   
      conspire to act as a single super mirror reflecting the sunlight toward   
      a fixed position, the power station's central tower. During the night   
      the mirrors stand motionless though. They reflect the light of the   
      countless distant stars, clusters and nebulae of the Milky Way and   
      beyond. This sci-fi night skyscape was created with a camera fixed to a   
      tripod near the edge of the giant mirror matrix on September 15. The   
      camera's combined sequence of digital exposures captures concentric   
      arcs of celestial star trails through the night with star trails in   
      surreal mirrored reflection.   
      
                  Tomorrow's picture: analog analemma's afternoon   
        __________________________________________________________________   
      
          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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