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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 May 31   
      
                                 Afterimage Sunset   
                  Image Credit & Copyright: Marcella Giulia Pace   
      
      Explanation: On May 7, the Sun setting behind a church bell tower was   
      captured in this filtered and manipulated digital skyscape from Ragusa,   
      Sicily, planet Earth. In this version of the image the colors look   
      bizarre. Still, an intriguing optical illusion known as an afterimage   
      can help you experience the same scene with a more natural looking   
      appearance. To try it, find the sunspots of active region AR4079   
      grouped near the bottom of the blue solar disk. Relax and stare at the   
      dark sunspot group for about 30 seconds, then close your eyes or shift   
      your gaze to a plain white surface. In a moment an afterimage of the   
      sunset should faintly appear. But the afterimage sunset will have this   
      image's complementary colors and a more normal yellow Sun against a   
      familiar blue sky.   
      
                      Tomorrow's picture: wildly interacting   
        __________________________________________________________________   
      
          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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