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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 May 5   
      
                             Shackleton from ShadowCam   
        Image Credit: NASA, ShadowCam, Korea Aerospace Research Institute,   
                             Arizona State University   
      
      Explanation: Shackleton crater lies at the lunar south pole. Peaks   
      along the 21 kilometer diameter are in sunlight, but Shackleton's floor   
      is in dark permanent shadow. Still, this image of the shadowed rim wall   
      and floor of Shackleton crater was captured from NASA's ShadowCam, an   
      instrument on board the Korea Pathfinder Lunar Orbiter (KPLO) launched   
      in August 2022. About 200 times more sensitive than, for example, the   
      Lunar Reconnaissance Orbiter's Narrow Angle Camera, ShadowCam was   
      designed image the permanently shadowed regions of the lunar surface.   
      Avoiding direct sunlight, those regions are expected to be reservoirs   
      of water-ice and other volatiles deposited by ancient cometary impacts   
      and useful to future Moon missions. Of course, the permanently shadowed   
      regions are still illuminated by reflections of sunlight from nearby   
      lunar terrain. In this stunningly detailed ShadowCam image, an arrow   
      marks the track made by a single boulder rolling down Shackleton   
      crater's wall. The image scale is indicated at the bottom of the frame.   
      
                     Tomorrow's picture: twilight in a flower   
        __________________________________________________________________   
      
          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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