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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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                           NASA Science Activation
                             & Michigan Tech. U.

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