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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 January 4   
      
                           Moons Beyond Rings at Saturn   
                Image Credit: NASA, ESA, JPL, Cassini Imaging Team   
      
      Explanation: What's happened to that moon of Saturn? Nothing --   
      Saturn's moon Rhea is just partly hidden behind Saturn's rings. In   
      2010, the robotic Cassini spacecraft then orbiting Saturn took this   
      narrow-angle view looking across the Solar System's most famous rings.   
      Rings visible in the foreground include the thin F ring on the outside   
      and the much wider A and B rings just interior to it. Although it seems   
      to be hovering over the rings, Saturn's moon Janus is actually far   
      behind them. Janus is one of Saturn's smaller moons and measures only   
      about 180 kilometers across. Farther out from the camera is the heavily   
      cratered Rhea, a much larger moon measuring 1,500 kilometers across.   
      The top of Rhea is visible only through gaps in the rings. After more   
      than a decade of exploration and discovery, the Cassini spacecraft ran   
      low on fuel in 2017 and was directed to enter Saturn's atmosphere,   
      where it surely melted.   
      
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          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
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