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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 28   
       A tan sphere is shown with dark markings and a few light craters. The   
       sphere is the largest known moon in the Solar System: Jupiter's moon   
        Ganymede. Please see the explanation for more detailed information.   
      
                                Ganymede from Juno   
        Image Credit & Copyright: NASA/JPL-Caltech/SwRI/MSSS; Processing &   
                              License: Kevin M. Gill;   
      
      Explanation: What does the largest moon in the Solar System look like?   
      Jupiter's moon Ganymede, larger than even Mercury and Pluto, has an icy   
      surface speckled with bright young craters overlying a mixture of   
      older, darker, more cratered terrain laced with grooves and ridges. The   
      cause of the grooved terrain remains a topic of research, with a   
      leading hypothesis relating it to shifting ice plates. Ganymede is   
      thought to have an ocean layer that contains more water than Earth --   
      and might contain life. Like Earth's Moon, Ganymede keeps the same face   
      towards its central planet, in this case Jupiter. The featured image   
      was captured in 2021 by NASA's robotic Juno spacecraft when it passed   
      by the immense moon. The close pass reduced Juno's orbital period   
      around Jupiter from 53 days to 43 days. Juno continues to study the   
      giant planet's high gravity, unusual magnetic field, and complex cloud   
      structures.   
      
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                        Tomorrow's picture: double twister   
        __________________________________________________________________   
      
          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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