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                        Astronomy Picture of the Day

   [1]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.

                                2021 April 4
     [2]Saturn's rings are pictured, nearly sideways, along with four of
                      Saturn's moons. See Explanation.

                   In, Through, and Beyond Saturn's Rings
   Image Credit: [3]Cassini Imaging Team, [4]ISS, [5]JPL, [6]ESA, [7]NASA

   Explanation: Four moons are visible on the [8]featured image -- can you
   find them all? First -- and farthest in the background -- is [9]Titan,
   the largest moon of [10]Saturn and one of the larger moons in the
   [11]Solar System. The dark feature across the top of this perpetually
   cloudy world is the [12]north polar hood. The next most obvious moon is
   bright [13]Dione, visible in the foreground, complete with craters and
   long [14]ice cliffs. Jutting in from the left are several of Saturn's
   [15]expansive rings, including Saturn's A ring featuring the dark
   [16]Encke Gap. On the far right, just outside the rings, is
   [17]Pandora, a moon only 80-kilometers across that [18]helps shepherd
   Saturn's F ring. The fourth moon? If you look closely inside Saturn's
   rings, in the [19]Encke Gap, you will find a speck that is actually
   [20]Pan. Although one of Saturn's smallest moons at 35-kilometers
   across, [21]Pan is massive enough to help keep the [22]Encke gap
   relatively free of ring particles. After more than a decade of
   exploration and discovery, the [23]Cassini spacecraft ran [24]low on
   fuel in 2017 and was directed to [25]enter Saturn's atmosphere, where
   it surely [26]melted.

                     Tomorrow's picture: remaining wisps
     __________________________________________________________________

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     __________________________________________________________________

    Authors & editors: [38]Robert Nemiroff ([39]MTU) & [40]Jerry Bonnell
                                 ([41]UMCP)
          NASA Official: Phillip Newman [42]Specific rights apply.
              [43]NASA Web Privacy Policy and Important Notices
                A service of: [44]ASD at [45]NASA / [46]GSFC
                           & [47]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2104/fourmoons_cassini_960.jpg
   3. http://ciclops.org/
   4. http://ciclops.org/iss/iss.php
   5. https://www.jpl.nasa.gov/
   6. https://www.esa.int/
   7. https://www.nasa.gov/
   8. https://photojournal.jpl.nasa.gov/catalog/PIA14579
   9. https://apod.nasa.gov/apod/ap110401.html
  10. https://apod.nasa.gov/apod/ap200419.html
  11. https://eyes.nasa.gov/apps/orrery/
  12. https://solarsystem.nasa.gov/resources/14689/titans-north-polar-hood/
  13. https://en.wikipedia.org/wiki/Dione_%28moon%29
  14. https://apod.nasa.gov/apod/ap060905.html
  15. https://apod.nasa.gov/apod/ap050525.html
  16. http://en.wikipedia.org/wiki/Encke_Division#Encke_Gap
  17. http://en.wikipedia.org/wiki/Pandora_%28moon%29
  18. http://www.youtube.com/watch?v=fdUlpeUFfxI
  19. https://apod.nasa.gov/apod/ap200527.html
  20. http://en.wikipedia.org/wiki/Pan_%28moon%29
  21. https://solarsystem.nasa.gov/moons/saturn-moons/pan/in-depth/
  22. https://www.planetary.org/space-images/pan-in-the-enke-gap-1
  23. https://solarsystem.nasa.gov/missions/cassini/mission/spacecraft/cassini-orbiter/
  24. https://www.lifewithdogs.tv/wp-content/uploads/2016/10/dog-tired.jpg
  25. https://apod.nasa.gov/apod/ap170125.html
  26. https://youtu.be/4u6A40QTWVI
  27. https://apod.nasa.gov/apod/ap210403.html
  28. https://apod.nasa.gov/apod/archivepix.html
  29. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  30. https://apod.nasa.gov/apod/lib/aptree.html
  31. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  32. https://apod.nasa.gov/apod/calendar/allyears.html
  33. https://apod.nasa.gov/apod.rss
  34. https://apod.nasa.gov/apod/lib/edlinks.html
  35. https://apod.nasa.gov/apod/lib/about_apod.html
  36. http://asterisk.apod.com/discuss_apod.php?date=210404
  37. https://apod.nasa.gov/apod/ap210405.html
  38. http://www.phy.mtu.edu/faculty/Nemiroff.html
  39. http://www.phy.mtu.edu/
  40. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  41. http://www.astro.umd.edu/
  42. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  43. https://www.nasa.gov/about/highlights/HP_Privacy.html
  44. https://astrophysics.gsfc.nasa.gov/
  45. https://www.nasa.gov/
  46. https://www.nasa.gov/centers/goddard/
  47. http://www.mtu.edu/