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.

                               2019 October 7
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                   Io Eclipse Shadow on Jupiter from Juno
     Image Credit & [3]License: [4]NASA/[5]JPL-Caltech/[6]SwRI/[7]MSSS;
                        Processing: [8]Kevin M. Gill

   Explanation: What's that dark spot on Jupiter? It's the shadow of
   [9]Jupiter's most volcanic moon [10]Io. Since Jupiter shines
   predominantly by reflected sunlight, anything that blocks that light
   [11]leaves a shadow. If you could somehow be in that shadow, you would
   see a [12]total eclipse of the Sun by [13]Io. [14]Io's shadow is about
   3600 kilometers across, roughly the same size as [15]Io itself -- and
   only slightly larger than [16]Earth's Moon. The [17]featured [18]image
   was [19]taken last month by NASA's robotic [20]Juno spacecraft
   currently orbiting Jupiter. About every two months, [21]Juno swoops
   close by Jupiter, takes a lot of data and snaps a series of images --
   some of which are [22]made into [23]a video. Among [24]many other
   things, Juno has been measuring Jupiter's gravitational field, finding
   [25]surprising evidence that Jupiter may be mostly a liquid. Under
   unexpectedly thick clouds, the Jovian giant may house a massive
   [26]liquid hydrogen region that extends all the way to the center.

                 Tomorrow's picture: sprite lightning in HD
     __________________________________________________________________

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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/1910/JupiterShadow_JunoGill_3535.jpg
   3. https://creativecommons.org/licenses/by/2.0/
   4. https://www.nasa.gov/
   5. https://www.jpl.nasa.gov/
   6. https://www.swri.org/
   7. http://www.msss.com/
   8. https://www.flickr.com/people/kevinmgill/
   9. https://solarsystem.nasa.gov/planets/jupiter/overview/
  10. https://solarsystem.nasa.gov/moons/jupiter-moons/io/overview/
  11. https://apod.nasa.gov/apod/ap110102.html
  12. https://apod.nasa.gov/apod/ap170820.html
  13. https://www.google.com/maps/space/io/
  14. https://apod.nasa.gov/apod/ap140330.html
  15. https://apod.nasa.gov/apod/ap160904.html
  16. https://apod.nasa.gov/apod/ap160201.html
  17. https://www.missionjuno.swri.edu/news/moon-shadow
  18. https://www.flickr.com/photos/kevinmgill/48745739051/
  19. https://www.youtube.com/watch?v=yfh1a_K_6Yc
  20. https://www.nasa.gov/mission_pages/juno/spacecraft/index.html
  21. https://www.youtube.com/watch?v=5F5aoC66cpY
  22. https://apod.nasa.gov/apod/ap190908.html
  23. https://apod.nasa.gov/apod/ap190205.html
  24. https://www.youtube.com/watch?v=ES2zBbWqSl4
  25. https://img.huffingtonpost.com/asset/5bad12683c000032000b0e42.jpeg
  26. https://en.wikipedia.org/wiki/Liquid_hydrogen
  27. https://apod.nasa.gov/apod/ap191006.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=191007
  37. https://apod.nasa.gov/apod/ap191008.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/