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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 June 20   
      
                               Rock Fingers on Mars   
                       Image Credit: NASA, JPL-Caltech, MSSS   
      
      Explanation: There, just right of center, what is that? The surface of   
      Mars keeps revealing new surprises with the recent discovery of   
      finger-like rock spires. The small nearly-vertical rock outcrops were   
      imaged last month by the robotic Curiosity rover on Mars. Although   
      similar in size and shape to small snakes, the leading explanation for   
      their origin is as conglomerations of small minerals left by water   
      flowing through rock crevices. After these relatively dense minerals   
      filled the crevices, they were left behind when the surrounding rock   
      eroded away. Famous rock outcrops on Earth with a similar origin are   
      called hoodoos. NASA's Curiosity Rover continues to search for new   
      signs of ancient water in Gale Crater on Mars, while also providing a   
      geologic background important for future human exploration.   
      
                   Explore Your Universe: Random APOD Generator   
                           Tomorrow's picture: city suns   
        __________________________________________________________________   
      
          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   
                                & Michigan Tech. U.   
      
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