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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 23   
      
                        Saturn, Tethys, Rings, and Shadows   
              Image Credit: Cassini Imaging Team, SSI, JPL, ESA, NASA   
      
      Explanation: Seen from ice moon Tethys, rings and shadows would display   
      fantastic views of the Saturnian system. Haven't dropped in on Tethys   
      lately? Then this gorgeous ringscape from the Cassini spacecraft will   
      have to do for now. Caught in sunlight just below and left of picture   
      center in 2005, Tethys itself is about 1,000 kilometers in diameter and   
      orbits not quite five saturn-radii from the center of the gas giant   
      planet. At that distance (around 300,000 kilometers) it is well outside   
      Saturn's main bright rings, but Tethys is still one of five major moons   
      that find themselves within the boundaries of the faint and tenuous   
      outer E ring. Discovered in the 1980s, two very small moons Telesto and   
      Calypso are locked in stable along Tethys' orbit. Telesto precedes and   
      Calypso follows Tethys as the trio circles Saturn.   
      
                          Tomorrow's picture: witch star?   
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          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
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                                & Michigan Tech. U.   
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