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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.   
      
                                   2025 June 29   
        Viewed from above, a landscape on Mars features many ridges of pink   
      sand. Superposed on some of these ridges are thin brown stipes. Please   
                see the explanation for more detailed information.   
      
                            Dark Sand Cascades on Mars   
                Image Credit: NASA, HiRISE, MRO, LPL (U. Arizona),   
      
      Explanation: Are these trees growing on Mars? No. Groups of dark brown   
      streaks have been photographed by the Mars Reconnaissance Orbiter on   
      melting pinkish sand dunes covered with light frost. The featured image   
      was taken in 2008 April near the North Pole of Mars. At that time, dark   
      sand on the interior of Martian sand dunes became more and more visible   
      as the spring Sun melted the lighter carbon dioxide ice. When occurring   
      near the top of a dune, dark sand may cascade down the dune leaving   
      dark surface streaks -- streaks that might appear at first to be trees   
      standing in front of the lighter regions but cast no shadows. Objects   
      about 25 centimeters across are resolved on this image spanning about   
      one kilometer. Close ups of some parts of this image show billowing   
      plumes indicating that the sand slides were occurring even while the   
      image was being taken.   
      
        Celestial Surprise: What picture did APOD feature on your birthday?   
                                    (post 1995)   
                         Tomorrow's picture: raining stars   
        __________________________________________________________________   
      
          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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