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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 31   
      
                               Siccar Point on Mars   
        Image Credit: NASA/JPL-Caltech/MSSS; Processing & License: Kevin M.   
                                       Gill   
      
      Explanation: What created this unusual hill on Mars? No one is sure. A   
      good outlook to survey the surrounding area, Siccar Point stands out   
      from its surroundings in Gale Crater. The unusual mound was visited by   
      the robotic Curiosity rover exploring Mars late last year. Siccar Point   
      not only has a distinctive shape, it has dark rocks above lighter   
      rocks. The apparent much younger age of the dark rocks indicates a   
      time-break in the usual geological ordering of rock layers -- by a   
      process yet unknown. The Martian hill is named for Siccar Point on   
      Earth, a place in Scotland itself distinctive as a junction between two   
      different rock layers. Curiosity continues to explore Gale crater on   
      Mars, looking for clues of ancient life. Simultaneously, 2300   
      kilometers away, its sister rover Perseverance explores Jezero crater,   
      there assisted by the flight-capable scout Ingenuity.   
      
                          Tomorrow's picture: open space   
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          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
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