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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 21   
         The Sun is pictured complete with active regions, filaments, and   
       prominences. Down the Sun's face is a series of silhouettes that are   
      the International Space Station passing right in front. Please see the   
                    explanation for more detailed information.   
      
                    International Space Station Crosses the Sun   
                    Image Credit & Copyright: Pau Montplet Sanz   
      
      Explanation: Typically, the International Space Station is visible only   
      at night. Slowly drifting across the night sky as it orbits the Earth,   
      the International Space Station (ISS) can be seen as a bright spot   
      about once a month from many locations. The ISS is then visible only   
      just after sunset or just before sunrise because it shines by reflected   
      sunlight -- once the ISS enters the Earth's shadow, it will drop out of   
      sight. The only occasion when the ISS is visible during the day is when   
      it passes right in front of the Sun. Then, it passes so quickly that   
      only cameras taking short exposures can visually freeze the ISS's   
      silhouette onto the background Sun. The featured picture did exactly   
      that -- it is actually a series of images taken a month ago from Sant   
      Feliu de Buixalleu, Spain with perfect timing. This image series was   
      later combined with a separate image highlighting the texture of the   
      active Sun which included several Sun's prominences around the edge.   
      
        Celestial Surprise: What picture did APOD feature on your birthday?   
                                    (post 1995)   
                          Tomorrow's picture: pluto below   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Amber Straughn Specific rights apply.   
                     NASA Web Privacy, Accessibility, Notices;   
                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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