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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 February 1   
      
                            Nacreous Clouds over Sweden   
                       Image Credit & Copyright: Vojan H++fer   
      
      Explanation: Vivid and lustrous, wafting iridescent waves of color wash   
      across this skyscape from northern Sweden. Known as nacreous clouds or   
      mother-of-pearl clouds, they are rare. But their unforgettable   
      appearance was captured in this snapshot on January 12 with the Sun   
      just below the local horizon. 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 diffract the sunlight even when the Sun   
      itself is hidden from direct view.   
      
                      Tomorrow's picture: comet disintegrates   
        __________________________________________________________________   
      
          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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