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.

                                2022 July 17
    [2]The featured image shows Jupiter's moon Europa in front of Jupiter
    with many of Jupiter's clouds, including the Great Red Spot, visible.
          Please see the explanation for more detailed information.

                      Europa and Jupiter from Voyager 1
     Image Credit: [3]NASA, [4]Voyager 1, [5]JPL, Caltech; Processing &
               [6]License: [7]Alexis Tranchandon / [8]Solaris

   Explanation: What are those spots on Jupiter? Largest and furthest,
   just right of center, is the [9]Great Red Spot -- a huge [10]storm
   system that has been raging on [11]Jupiter possibly since [12]Giovanni
   Cassini's likely notation of it [13]357 years ago. It is not yet known
   why this [14]Great Spot is red. The spot toward the lower left is one
   of Jupiter's largest moons: [15]Europa. Images from [16]Voyager in 1979
   bolster the modern hypothesis that [17]Europa has an underground ocean
   and is therefore a good place to [18]look for extraterrestrial life.
   But what about the dark spot on the upper right? That is a [19]shadow
   of another of Jupiter's large moons: [20]Io. Voyager 1 discovered
   [21]Io to be so volcanic that no [22]impact craters could be found.
   Sixteen frames from [23]Voyager 1's flyby of Jupiter in 1979 were
   recently reprocessed and merged to create the [24]featured image.
   [25]Forty-five years ago this August, [26]Voyager 1 launched from Earth
   and started one of the [27]greatest explorations of the [28]Solar
   System ever.

                     Free Download: [29]Voyager Posters
                       Tomorrow's picture: hubble webb
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    Authors & editors: [41]Robert Nemiroff ([42]MTU) & [43]Jerry Bonnell
                                 ([44]UMCP)
          NASA Official: Phillip Newman [45]Specific rights apply.
              [46]NASA Web Privacy Policy and Important Notices
                A service of: [47]ASD at [48]NASA / [49]GSFC
                           & [50]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2207/EuropaJupiter_Voyager_2792.jpg
   3. https://www.nasa.gov/
   4. https://voyager.jpl.nasa.gov/
   5. https://www.jpl.nasa.gov/
   6. https://creativecommons.org/licenses/by-nc-sa/2.0/
   7. mailto: alexis.tranchandoni @at@ gmail .dot. com
   8. https://www.flickr.com/photos/alex-is-solaris/
   9. https://en.wikipedia.org/wiki/Great_Red_Spot
  10. https://apod.nasa.gov/apod/ap140518.html
  11. https://solarsystem.nasa.gov/planets/jupiter/overview/
  12. https://en.wikipedia.org/wiki/Giovanni_Domenico_Cassini
  13. https://en.wikipedia.org/wiki/1665
  14. https://www.nasa.gov/feature/goddard/jupiter-s-great-red-spot-a-swirling-mystery
  15. https://en.wikipedia.org/wiki/Europa_(moon)
  16. https://apod.nasa.gov/apod/ap031120.html
  17. https://solarsystem.nasa.gov/moons/jupiter-moons/europa/in-depth/
  18. https://apod.nasa.gov/debate/debate100th.html
  19. https://i.pinimg.com/736x/06/92/52/0692529495c94007c17abdddaffd31cf.jpg
  20. https://solarsystem.nasa.gov/moons/jupiter-moons/io/overview/
  21. https://apod.nasa.gov/apod/ap140330.html
  22. https://apod.nasa.gov/apod/ap141021.html
  23. https://voyager.jpl.nasa.gov/
  24. https://www.flickr.com/photos/alex-is-solaris/29919234526/in/dateposted-public/
  25. https://www.jpl.nasa.gov/events/voyager-45-years-in-space
  26. https://www.youtube.com/watch?v=xs-gJs1CKBY
  27. https://apod.nasa.gov/apod/ap170902.html
  28. https://apod.nasa.gov/apod/ap170211.html
  29. https://voyager.jpl.nasa.gov/downloads/
  30. https://apod.nasa.gov/apod/ap220716.html
  31. https://apod.nasa.gov/apod/archivepix.html
  32. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  33. https://apod.nasa.gov/apod/lib/aptree.html
  34. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  35. https://apod.nasa.gov/apod/calendar/allyears.html
  36. https://apod.nasa.gov/apod.rss
  37. https://apod.nasa.gov/apod/lib/edlinks.html
  38. https://apod.nasa.gov/apod/lib/about_apod.html
  39. http://asterisk.apod.com/discuss_apod.php?date=220717
  40. https://apod.nasa.gov/apod/ap220718.html
  41. http://www.phy.mtu.edu/faculty/Nemiroff.html
  42. http://www.phy.mtu.edu/
  43. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  44. http://www.astro.umd.edu/
  45. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  46. https://www.nasa.gov/about/highlights/HP_Privacy.html
  47. https://astrophysics.gsfc.nasa.gov/
  48. https://www.nasa.gov/
  49. https://www.nasa.gov/centers/goddard/
  50. http://www.mtu.edu/