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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.   
      
                                 2025 November 22   
      
                            Dione and Rhea Ring Transit   
                     Image Credit & Copyright: Christopher Go   
      
      Explanation: Seen to the left of Saturn's banded planetary disk, small   
      icy moons Dione and Rhea are caught passing in front of the gas giant's   
      extensive ring system in this sharp telescopic snapshot. The remarkable   
      image was recorded on November 20, when Saturn's rings were nearly   
      edge-on when viewed from planet Earth. In fact, every 13 to 16 years   
      the view from planet Earth aligns with Saturn's ring plane to produce a   
      series of ring plane crossings. During a ring plane crossing, the   
      interplanetary edge-on perspective makes the thin but otherwise bright   
      rings seem to disappear. By November 23rd Saturn's rings will have   
      reached a minimum angle for now, at their narrowest for viewing from   
      planet Earth, but then start to widen again. Of course, Dione and Rhea   
      orbit Saturn near the ring plane once every 2.7 and 4.5 days   
      respectively, while the next series of Saturn ring plane crossings as   
      seen from Earth will begin again in 2038.   
      
              Tomorrow's picture: everything, everywhere, all at once   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Amber Straughn Specific rights apply.   
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                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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