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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 July 11   
      
                                The Veins of Heaven   
              Image Credit & Copyright: P-M Hed+¬n (Clear Skies, TWAN)   
      
      Explanation: Transfusing sunlight as the sky grew darker, this   
      exceptional display of noctilucent clouds was captured on July 10,   
      reflected in the calm waters of Vallentuna Lake near Stockholm, Sweden.   
      From the edge of space, about 80 kilometers above Earth's surface, the   
      icy clouds themselves still reflect sunlight, even though the Sun is   
      below the horizon as seen from the ground. Usually spotted at high   
      latitudes in summer months, the night shining clouds have made a strong   
      showing so far during the short northern summer nights. Also known as   
      polar mesopheric clouds they are understood to form as water vapor   
      driven into the cold upper atmosphere condenses on the fine dust   
      particles supplied by disintegrating meteors or volcanic ash.   
      
                         Tomorrow's picture: light-weekend   
        __________________________________________________________________   
      
          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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