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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.   
      
                                  2022 August 25   
      
                     Tiangong Space Station Transits the Moon   
                      Image Credit & Copyright: Lucy Yunxi Hu   
      
      Explanation: The rugged lunar south polar region lies at the top of   
      this colorful portrait of a last quarter Moon made on August 20.   
      Constructed from video frames and still images taken at Springrange,   
      New South Wales, Australia it also captures a transit of China's   
      Tiangong Space Station. The transit itself was fleeting, taking the   
      space station less than a second to cross the shadowed and sunlit lunar   
      disk. The low Earth orbiting Tiangong is at an altitude of about 400   
      kilometers, while the Moon is some 400,000 kilometers away. Subtle   
      color differences along the bright lunar surface are revealed in the   
      multiple stacked frames. Not visible to the eye, they indicate real   
      differences in chemical makeup across the lunar surface.   
      
                         Tomorrow's picture: little planet   
        __________________________________________________________________   
      
          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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