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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 July 17   
      
                         Europa and Jupiter from Voyager 1   
        Image Credit: NASA, Voyager 1, JPL, Caltech; Processing & License:   
                           Alexis Tranchandon / Solaris   
      
      Explanation: What are those spots on Jupiter? Largest and furthest,   
      just right of center, is the Great Red Spot -- a huge storm system that   
      has been raging on Jupiter possibly since Giovanni Cassini's likely   
      notation of it 357 years ago. It is not yet known why this Great Spot   
      is red. The spot toward the lower left is one of Jupiter's largest   
      moons: Europa. Images from Voyager in 1979 bolster the modern   
      hypothesis that Europa has an underground ocean and is therefore a good   
      place to look for extraterrestrial life. But what about the dark spot   
      on the upper right? That is a shadow of another of Jupiter's large   
      moons: Io. Voyager 1 discovered Io to be so volcanic that no impact   
      craters could be found. Sixteen frames from Voyager 1's flyby of   
      Jupiter in 1979 were recently reprocessed and merged to create the   
      featured image. Forty-five years ago this August, Voyager 1 launched   
      from Earth and started one of the greatest explorations of the Solar   
      System ever.   
      
                          Free Download: Voyager Posters   
                          Tomorrow's picture: hubble webb   
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          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
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                                & Michigan Tech. U.   
      
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