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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 June 13   
      
                               Moons Across Jupiter   
       Image Credit: NASA; ESA, JPL, Cassini Imaging Team, SSI; Processing:   
                                   Kevin M. Gill   
      
      Explanation: Jupiter's moons circle Jupiter. The featured video depicts   
      Europa and Io, two of Jupiter's largest moons, crossing in front of the   
      grand planet's Great Red Spot, the largest known storm system in our   
      Solar System. The video was composed from images taken by the robotic   
      Cassini spacecraft as it passed Jupiter in 2000, on its way to Saturn.   
      The two moons visible are volcanic Io, in the distance, and icy Europa.   
      In the time-lapse video, Europa appears to overtake Io, which is odd   
      because Io is closer to Jupiter and moves faster. The explanation is   
      that the motion of the fast Cassini spacecraft changes the camera   
      location significantly during imaging. Jupiter is currently being   
      visited by NASA's robotic Juno spacecraft, while ESA's Jupiter Icy   
      Moons Explorer (JUICE), launched in April, is enroute.   
      
                     Tomorrow's picture: interstellar predator   
        __________________________________________________________________   
      
          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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