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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 2   
       A view of Mars from the Curiosity rover on Mars is pictured in black   
        and white. Many rocks and hills are visible, with a hill containing   
          many unusually flat rocks visible on the right. Please see the   
                    explanation for more detailed information.   
      
                              Flat Rock Hills on Mars   
      Image Credit & Copyright: NASA, JPL-Caltech, MSSS; Processing: Neville   
                                     Thompson   
      
      Explanation: Why are there so many flat rocks on Mars? Some views of   
      plains and hills on Mars show many rocks that are unusually flat when   
      compared to rocks on Earth. One reason for this is a process that is   
      common to both Mars and Earth: erosion. The carbon-dioxide wind on Mars   
      can act like sandpaper when it blows around gritty Martian sand. This   
      sand can create differential erosion, smoothing over some rocks, while   
      wearing down the tops of other long-exposed stones. The featured image   
      capturing several hills covered with flat-topped rocks was taken last   
      month by NASA's Curiosity Rover on Mars. This robotic rover has now   
      been rolling across Mars for ten years and has helped uncover many   
      details of the wet and windy past of Earth's planetary neighbor. After   
      taking this and other images, Curiosity carefully navigated stones and   
      slippery sand to climb up Marker Band Valley.   
      
                       Tomorrow's picture: black hole galaxy   
        __________________________________________________________________   
      
          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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