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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 April 27   
      
                              Moon Shadow on Jupiter   
      Image Credit: NASA/JPL-Caltech/SwRI/MSSS; Processing & License: Thomas   
                                    Thomopoulos   
      
      Explanation: What is that large dark spot on Jupiter? It's the shadow   
      of Ganymede, Jupiter's largest moon. When Jupiter's moons cross between   
      the Jovian giant and the Sun, they created shadows just like when the   
      Earth's moon crosses between the Earth and the Sun. Also like on Earth,   
      if you were in a dark shadow on Jupiter, you would see a moon   
      completely eclipse the Sun. Unlike on Earth, moon shadows occur most   
      days on Jupiter -- what's more unusual is that a spacecraft was close   
      enough to record one with a high-resolution image. That spacecraft,   
      Juno, was passing so close to Jupiter in late February that nearby   
      clouds and the dark eclipse shadow appear relatively large. Juno has   
      made many discoveries about our Solar System's largest planet,   
      including, recently, rapidly expanding circular auroras.   
      
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