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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 April 10   
      
                         Shadows at the Moon's South Pole   
        Image Credit: NASA, Arizona State U., Lunar Reconnaissance Orbiter   
      
      Explanation: Was this image of the Moon's surface taken with a   
      microscope? No -- it's a multi-temporal illumination map made with a   
      wide-angle camera. To create it, the Lunar Reconnaissance Orbiter   
      spacecraft collected 1,700 images over a period of 6 lunar days (6   
      Earth months), repeatedly covering an area centered on the Moon's south   
      pole from different angles. The resulting images were stacked to   
      produce the featured map -- representing the percentage of time each   
      spot on the surface was illuminated by the Sun. Remaining convincingly   
      in shadow, the floor of the 19-kilometer diameter Shackleton crater is   
      seen near the map's center. The lunar south pole itself is at about 9   
      o'clock on the crater's rim. Crater floors near the lunar south and   
      north poles can remain in permanent shadow, while mountain tops can   
      remain in nearly continuous sunlight. Useful for future outposts, the   
      shadowed crater floors could offer reservoirs of water-ice, while the   
      sunlit mountain tops offer good locations to collect solar power.   
      
                          Tomorrow's picture: ISS Sunspot   
        __________________________________________________________________   
      
          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   
                                & Michigan Tech. U.   
      
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