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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 November 19   
       A silhouette of the International Space Station (ISS) is pictured in   
      front the top of the Sun, shown with great detail. An inset image shows   
           where on the ISS the Dragon capsule is docked. Please see the   
                    explanation for more detailed information.   
      
                       Space Station, Solar Prominences, Sun   
                      Image Credit & Copyright: Mehmet Ergu+ên   
      
      Explanation: That's no sunspot. It's the International Space Station   
      (ISS) caught passing in front of the Sun. Sunspots, individually, have   
      a dark central umbra, a lighter surrounding penumbra, and no Dragon   
      capsules attached. By contrast, the ISS is a complex and multi-spired   
      mechanism, one of the largest and most complicated spacecraft ever   
      created by humanity. Also, sunspots circle the Sun, whereas the ISS   
      orbits the Earth. Transiting the Sun is not very unusual for the ISS,   
      which orbits the Earth about every 90 minutes, but getting one's   
      location, timing and equipment just right for a great image is rare.   
      The featured picture combined three images all taken in 2021 from the   
      same location and at nearly the same time. One image -- overexposed --   
      captured the faint prominences seen across the top of the Sun, a second   
      image -- underexposed -- captured the complex texture of the Sun's   
      chromosphere, while the third image -- the hardest to get -- captured   
      the space station as it shot across the Sun in a fraction of a second.   
      Close inspection of the space station's silhouette even reveals a   
      docked Dragon Crew capsule.   
      
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                                     Taiwanese   
                          Tomorrow's picture: dark horse   
        __________________________________________________________________   
      
          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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