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 July 6
    [2]The picture shows the planet Saturn with several of its moons in a
       multiple exposure. Please see the explanation for more detailed
                                information.

                            Saturn and Six Moons
     Image Credit & Copyright: [3]Mohammad Ranjbaran; MR Thanks: [4]Amir
                                  Ehteshami

   Explanation: How many moons does Saturn have? [5]So far 82 have been
   confirmed, the smallest being only a fraction of a kilometer across.
   [6]Six of its largest satellites can be seen here in a [7]composite
   image with 13 short exposure of the bright planet, and 13 long
   exposures of the brightest of its faint moons, [8]taken over two weeks
   last month. [9]Larger than Earth's Moon and even slightly larger than
   [10]Mercury,Saturn's largest moon [11]Titan has a diameter of 5,150
   kilometers and was captured making nearly a complete orbit around its
   [12]ringed parent planet. Saturn's first known natural satellite, Titan
   was [13]discovered in 1655 by Dutch astronomer [14]Christiaan Huygens,
   in contrast with several [15]newly discovered moons announced in 2019.
   The trail on the far right belongs to [16]Iapetus, Saturn's third
   largest moon. The radius of [17]painted Iapetus' orbit is so large that
   only a portion of it was captured here. [18]Saturn leads Jupiter across
   the night sky [19]this month, rising soon after sunset toward the
   southeast, and remaining visible until [20]dawn.

                      Tomorrow's picture: through orion
     __________________________________________________________________

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    Authors & editors: [32]Robert Nemiroff ([33]MTU) & [34]Jerry Bonnell
                                 ([35]UMCP)
          NASA Official: Phillip Newman [36]Specific rights apply.
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                A service of: [38]ASD at [39]NASA / [40]GSFC
                           & [41]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2107/SaturnAndMoons_Ranjbaran_2692.jpg
   3. https://www.instagram.com/mohammad.rnjbrn/
   4. https://www.instagram.com/amir_ehteshami/
   5. https://en.wikipedia.org/wiki/Moons_of_Saturn#Confirmed_moons
   6. https://apod.nasa.gov/apod/ap120414.html
   7. https://www.instagram.com/p/CQrB9u6g9kM/
   8. https://www.instagram.com/p/CQuclL8HhBs/
   9. https://preview.redd.it/o9qhygvnt8m41.png?width=960&crop=smart&auto=webp&s=dcb20af670a475de7f0395ed628a06039a89bc31
  10. https://apod.nasa.gov/apod/ap170723.html
  11. https://solarsystem.nasa.gov/moons/saturn-moons/titan/overview/
  12. https://apod.nasa.gov/apod/ap200419.html
  13. https://apod.nasa.gov/apod/ap050325.html
  14. https://en.wikipedia.org/wiki/Christiaan_Huygens
  15. https://sites.google.com/carnegiescience.edu/sheppard/home/newsaturnmoons2019
  16. https://solarsystem.nasa.gov/moons/saturn-moons/iapetus/in-depth/
  17. https://apod.nasa.gov/apod/ap180603.html
  18. https://earthsky.org/astronomy-essentials/visible-planets-tonight-mars-jupiter-venus-saturn-mercury/
  19. https://solarsystem.nasa.gov/whats-up-skywatching-tips-from-nasa/
  20. https://i.redd.it/t8k7f6nvr8j31.jpg
  21. https://apod.nasa.gov/apod/ap210705.html
  22. https://apod.nasa.gov/apod/archivepix.html
  23. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  24. https://apod.nasa.gov/apod/lib/aptree.html
  25. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  26. https://apod.nasa.gov/apod/calendar/allyears.html
  27. https://apod.nasa.gov/apod.rss
  28. https://apod.nasa.gov/apod/lib/edlinks.html
  29. https://apod.nasa.gov/apod/lib/about_apod.html
  30. http://asterisk.apod.com/discuss_apod.php?date=210706
  31. https://apod.nasa.gov/apod/ap210707.html
  32. http://www.phy.mtu.edu/faculty/Nemiroff.html
  33. http://www.phy.mtu.edu/
  34. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  35. http://www.astro.umd.edu/
  36. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  37. https://www.nasa.gov/about/highlights/HP_Privacy.html
  38. https://astrophysics.gsfc.nasa.gov/
  39. https://www.nasa.gov/
  40. https://www.nasa.gov/centers/goddard/
  41. http://www.mtu.edu/