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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 July 7   
       A landscape shows the sky above, shallow water in front, and hills to   
         the right. The sunset sky is filled with beautifully multicolored   
      clouds. These clouds are clearly reflected by the calm water in front.   
             Please see the explanation for more detailed information.   
      
                           Iridescent Clouds over Sweden   
                            Image Credit: Goran Strand   
      
      Explanation: Why are these clouds multi-colored? A relatively rare   
      phenomenon in clouds known as iridescence can bring up unusual colors   
      vividly -- or even a whole spectrum of colors simultaneously. These   
      polar stratospheric clouds also, known as nacreous and mother-of-pearl   
      clouds, are formed of small water droplets of nearly uniform size. When   
      the Sun is in the right position and, typically, hidden from direct   
      view, these thin clouds can be seen significantly diffracting sunlight   
      in a nearly coherent manner, with different colors being deflected by   
      different amounts. Therefore, different colors will come to the   
      observer from slightly different directions. Many clouds start with   
      uniform regions that could show iridescence but quickly become too   
      thick, too mixed, or too angularly far from the Sun to exhibit striking   
      colors. The featured image and an accompanying video were taken late in   
      2019 over Ostersund, Sweden.   
      
                    Tomorrow's picture: red planet, blue planet   
        __________________________________________________________________   
      
          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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