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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.   
      
                                 2024 November 10   
       A picture of Mars is shown as a large orange globe. Across the center   
      of the planet a long canyon is visible. Please see the explanation for   
                            more detailed information.   
      
                    Valles Marineris: The Grand Canyon of Mars   
                     Image Credit: NASA, USGS, Viking Project   
      
      Explanation: The largest canyon in the Solar System cuts a wide swath   
      across the face of Mars. Named Valles Marineris, the grand valley   
      extends over 3,000 kilometers long, spans as much as 600 kilometers   
      across, and delves as much as 8 kilometers deep. By comparison, the   
      Earth's Grand Canyon in Arizona, USA is 800 kilometers long, 30   
      kilometers across, and 1.8 kilometers deep. The origin of the Valles   
      Marineris remains unknown, although a leading hypothesis holds that it   
      started as a crack billions of years ago as the planet cooled. Several   
      geologic processes have been identified in the canyon. The featured   
      mosaic was created from over 100 images of Mars taken by Viking   
      Orbiters in the 1970s.   
      
                          Tomorrow's picture: comet tails   
        __________________________________________________________________   
      
          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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