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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.   
      
                                   2025 July 20   
      
                                  Lunar Nearside   
      Image Credit: NASA / GSFC / Arizona State Univ. / Lunar Reconnaissance   
                                      Orbiter   
      
      Explanation: About 1,300 images from the Lunar Reconnaissance Orbiter   
      spacecraft's wide angle camera were used to compose this spectacular   
      view of a familiar face - the lunar nearside. But why is there a lunar   
      nearside? The Moon rotates on its axis and orbits the Earth at the same   
      rate, about once every 28 days. Tidally locked in this configuration,   
      the synchronous rotation always keeps one side, the nearside, facing   
      Earth. As a result, featured in remarkable detail in the full   
      resolution mosaic, the smooth, dark, lunar maria (actually lava-flooded   
      impact basins), and rugged highlands, are well-known to earthbound   
      skygazers. To find your favorite mare or large crater, just follow this   
      link or slide your cursor over the picture. The LRO images used to   
      construct the mosaic were recorded over a two week period in December   
      2010.   
      
                        Tomorrow's picture: pixels in space   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Amber Straughn Specific rights apply.   
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                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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