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.

                               2023 October 23
      [2]Jupiter's moon Io is shown as photogaphred recently by NASA's
    passing Juno spacecraft. The moon is nearly half- lit by the distant
    Sun and shows a complex surface including the colors yellow, orange,
     and dark brown. Near the top, the plume of an active volcano can be
       seen. Please see the explanation for more detailed information.

                        Moon Io from Spacecraft Juno
    Image Credit: [3]NASA, [4]JPL-Caltech, [5]SwRI, [6]MSSS; Processing &
            Copyright: [7]Ted Stryk & [8]Fernando García Navarro

   Explanation: There goes another one! Volcanoes on [9]Jupiter's moon
   [10]Io keep erupting. To investigate, [11]NASA's robotic [12]Juno
   spacecraft has begun a series of visits to this [13]very strange moon.
   [14]Io is about the size of Earth's moon, but because of
   [15]gravitational flexing by Jupiter and other moons, Io's interior
   gets heated and its surface has become [16]covered with volcanoes. The
   featured image is from [17]last week's flyby, passing within 12,000
   kilometers above the dangerously active world. The [18]surface of Io is
   covered with sulfur and frozen sulfur dioxide, making it appear yellow,
   orange and brown. As hoped, [19]Juno flew by [20]just as a volcano was
   erupting -- with its faint plume visible near the top of the featured
   image. Studying Io's volcanoes and plumes helps humanity better
   understand how [21]Jupiter's complex system of moons, rings, and
   auroras interact. [22]Juno is scheduled to make two flybys of Io during
   the coming months that are almost 10 times closer: one in December and
   another in February 2024.

      Help Wanted: [23]Professional-astronomer level guest writers and
                         assistant editors for APOD
                       Tomorrow's picture: eclipse sky
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    Authors & editors: [35]Robert Nemiroff ([36]MTU) & [37]Jerry Bonnell
                                 ([38]UMCP)
          NASA Official: Phillip Newman [39]Specific rights apply.
              [40]NASA Web Privacy Policy and Important Notices
                A service of: [41]ASD at [42]NASA / [43]GSFC,
                         [44]NASA Science Activation
                           & [45]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2310/IoFlyby_Juno_2047.jpg
   3. https://www.nasa.gov/
   4. https://www.jpl.nasa.gov/
   5. https://www.swri.org/
   6. http://www.msss.com/
   7. https://twitter.com/tedstryk
   8. mailto: fergarcia at me.com
   9. https://science.nasa.gov/jupiter/
  10. https://en.wikipedia.org/wiki/Io_(moon)
  11. https://www.nasa.gov/about/
  12. https://www.jpl.nasa.gov/missions/juno
  13. https://www.intermountainpet.com/hubfs/Blog_Images/Dogs-tilting-their-heads.jpg
  14. https://planetary.s3.amazonaws.com/web/assets/pictures/20130619_solar-system-major-moons-by-location-withtext.jpg
  15. https://en.wikipedia.org/wiki/Volcanism_on_Io#Heat_source
  16. https://apod.nasa.gov/apod/ap110522.html
  17. https://youtu.be/yJUJmI8YI_E
  18. https://apod.nasa.gov/apod/ap221211.html
  19. https://science.nasa.gov/mission/juno/
  20. https://www.universetoday.com/163766/juno-completes-its-closest-flyby-of-io-yet/
  21. https://apod.nasa.gov/apod/ap220830.html
  22. https://en.wikipedia.org/wiki/Exploration_of_Io#Juno_spacecraft
  23. https://asterisk.apod.com/viewtopic.php?t=43388
  24. https://apod.nasa.gov/apod/ap231022.html
  25. https://apod.nasa.gov/apod/archivepix.html
  26. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  27. https://apod.nasa.gov/apod/lib/aptree.html
  28. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  29. https://apod.nasa.gov/apod/calendar/allyears.html
  30. https://apod.com/feed.rss
  31. https://apod.nasa.gov/apod/lib/edlinks.html
  32. https://apod.nasa.gov/apod/lib/about_apod.html
  33. https://asterisk.apod.com/discuss_apod.php?date=231023
  34. https://apod.nasa.gov/apod/ap231024.html
  35. http://www.phy.mtu.edu/faculty/Nemiroff.html
  36. http://www.phy.mtu.edu/
  37. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  38. http://www.astro.umd.edu/
  39. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  40. https://www.nasa.gov/about/highlights/HP_Privacy.html
  41. https://astrophysics.gsfc.nasa.gov/
  42. https://www.nasa.gov/
  43. https://www.nasa.gov/centers/goddard/
  44. https://science.nasa.gov/learners
  45. http://www.mtu.edu/