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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 July 16   
      
                             Tycho and Clavius at Dawn   
               Image Credit & Copyright: Eduardo Schaberger Poupeau   
      
      Explanation: South is up in this dramatic telescopic view of the lunar   
      terminator and the Moon's rugged southern highlands. The lunar   
      landscape was captured on July 7 with the moon at its first quarter   
      phase. The Sun shines at a low angle from the right as dawn comes to   
      the region's young and old craters Tycho and Clavius. About 100 million   
      years young, Tycho is the sharp-walled 85 kilometer diameter crater   
      below and left of center. Its 2 kilometer tall central peak and far   
      crater wall reflect bright sunlight, Its smooth floor lies in dark   
      shadow. Debris ejected during the impact that created Tycho make it the   
      stand out lunar crater when the Moon is near full though. They produce   
      a highly visible radiating system of light streaks or rays that extend   
      across much of the lunar near side. In fact, some of the material   
      collected at the Apollo 17 landing site, about 2,000 kilometers away,   
      likely originated from the Tycho impact. One of the oldest and largest   
      craters on the Moon's near side, 225 kilometer diameter Clavius is due   
      south (above) of Tycho. Clavius crater's own ray system resulting from   
      its original impact event would have faded long ago. The old crater's   
      worn walls and smooth floor are now overlayed by newer smaller craters   
      from impacts that occurred after Clavius was formed. Reaching above the   
      older crater, tops of the newer crater walls reflect this dawn's early   
      light to create narrow shining arcs within a shadowed Clavius.   
      
                      Tomorrow's picture: Europa and Jupiter   
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