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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.   
      
                                  2023 February 9   
      
                           Nacreous Clouds over Lapland   
                     Image Credit & Copyright: Dennis Lehtonen   
      
      Explanation: Vivid and lustrous, wafting iridescent waves of color wash   
      across this skyscape from KilpisjSrvi, Finland. Known as nacreous   
      clouds or mother-of-pearl clouds, they are rare. But their   
      unforgettable appearance was captured looking south at 69 degrees north   
      latitude at sunset on January 24. A type of polar stratospheric cloud,   
      they form when unusually cold temperatures in the usually cloudless   
      lower stratosphere form ice crystals. Still sunlit at altitudes of   
      around 15 to 25 kilometers, the clouds can diffract sunlight even after   
      sunset and just before the dawn.   
      
                        Tomorrow's picture: pixels in space   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
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                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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