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   CHRS: LATIN-1 2   
                           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.   
      
                                    2025 July 6   
      A computer construction of what the north pole of Mars looks like. The   
      picture was constructed from measured altitude data. A spiral landscape   
         is seen that is colored red but is mostly covered with white ice.   
             Please see the explanation for more detailed information.   
      
                           The Spiral North Pole of Mars   
            Image Credit: ESA/DLR/FU Berlin; NASA MGS MOLA Science Team   
      
      Explanation: Why is there a spiral around the North Pole of Mars? Each   
      winter this pole develops a new outer layer about one meter thick   
      composed of carbon dioxide frozen out of the thin Martian atmosphere.   
      This fresh layer is deposited on a water-ice layer that exists year   
      round. Strong winds blow down from above the cap's center and swirl due   
      to the spin of the red planet -- contributing to Planum Boreum's spiral   
      structure. The featured image is a perspective mosaic generated in 2017   
      from numerous images taken by ESA's Mars Express and elevations   
      extracted from the laser altimeter aboard NASA's Mars Global Surveyor   
      mission.   
      
                          Tomorrow's picture: alien comet   
        __________________________________________________________________   
      
          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.   
      
   --- BBBS/Li6 v4.10 Toy-7   
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