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 November 29
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                         Galileo's Europa Remastered
    Image Credit: [3]NASA, [4]JPL-Caltech, [5]SETI Institute, [6]Cynthia
                           Phillips, Marty Valenti

   Explanation: Looping through the Jovian system in the late 1990s, the
   [7]Galileo spacecraft recorded stunning views of Europa and uncovered
   evidence that the moon's icy surface likely hides a deep, global ocean.
   Galileo's Europa image data has been [8]remastered here, using improved
   new calibrations to produce a color image approximating what the human
   eye might see. Europa's long curving fractures [9]hint at the
   subsurface liquid water. The tidal flexing [10]the large moon
   experiences in its elliptical orbit around Jupiter supplies the energy
   to keep the ocean liquid. But more [11]tantalizing is the possibility
   that even in the absence of sunlight that process could also supply the
   energy to support life, [12]making Europa one of the best places to
   look for life beyond Earth. What kind of life could thrive in a deep,
   dark, subsurface ocean? Consider planet Earth's own [13]extreme shrimp.

                 Tomorrow's picture: red planet star trails
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    Authors & editors: [25]Robert Nemiroff ([26]MTU) & [27]Jerry Bonnell
                                 ([28]UMCP)
          NASA Official: Phillip Newman [29]Specific rights apply.
              [30]NASA Web Privacy Policy and Important Notices
                A service of: [31]ASD at [32]NASA / [33]GSFC
                           & [34]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/1911/PIA19048europa.jpg
   3. https://www.nasa.gov/
   4. http://www.jpl.nasa.gov/
   5. http://www.seti.org/
   6. http://www.seti.org/users/cynthia-phillips
   7. https://solarsystem.nasa.gov/galileo/
   8. https://photojournal.jpl.nasa.gov/catalog/?IDNumber=PIA19048
   9. https://www.nasa.gov/feature/goddard/2019/nasa-scientists-confirm-water-vapor-on-europa
  10. https://apod.nasa.gov/apod/ap160401.html
  11. https://apod.nasa.gov/apod/ap140919.html
  12. https://europa.nasa.gov/
  13. https://www.nasa.gov/jpl/extreme-shrimp-may-hold-clues-to-alien-life/
  14. https://apod.nasa.gov/apod/ap191128.html
  15. https://apod.nasa.gov/apod/archivepix.html
  16. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  17. https://apod.nasa.gov/apod/lib/aptree.html
  18. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  19. https://apod.nasa.gov/apod/calendar/allyears.html
  20. https://apod.nasa.gov/apod.rss
  21. https://apod.nasa.gov/apod/lib/edlinks.html
  22. https://apod.nasa.gov/apod/lib/about_apod.html
  23. http://asterisk.apod.com/discuss_apod.php?date=191129
  24. https://apod.nasa.gov/apod/ap191130.html
  25. http://www.phy.mtu.edu/faculty/Nemiroff.html
  26. http://www.phy.mtu.edu/
  27. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  28. http://www.astro.umd.edu/
  29. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  30. https://www.nasa.gov/about/highlights/HP_Privacy.html
  31. https://astrophysics.gsfc.nasa.gov/
  32. https://www.nasa.gov/
  33. https://www.nasa.gov/centers/goddard/
  34. http://www.mtu.edu/