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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.   
      
                                   2022 July 12   
      
                           Noctilucent Clouds over Paris   
                        Credit & Copyright: Bertrand Kulik   
      
      Explanation: It's northern noctilucent cloud season. Composed of small   
      ice crystals forming only during specific conditions in the upper   
      atmosphere, noctilucent clouds may become visible at sunset during late   
      summer when illuminated by sunlight from below. Noctilucent clouds are   
      the highest clouds known and now established to be polar mesospheric   
      clouds observed from the ground. Although observed with NASA's AIM   
      satellite since 2007, much about noctilucent clouds remains unknown and   
      so a topic of active research. The featured image shows expansive and   
      rippled noctilucent clouds wafting over Paris, France. This year,   
      several northern locations are already reporting especially vivid   
      displays of noctilucent clouds.   
      
                          Tomorrow's picture: webb begins   
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          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
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                                & Michigan Tech. U.   
      
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