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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.
                  NASA Web Privacy, Accessibility, Notices;
                      A service of: ASD at NASA / GSFC,
                           NASA Science Activation
                             & Michigan Tech. U.

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