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                        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.

                              2020 September 1

         IFRAME: [2]https://www.youtube.com/embed/ALaOGmu1S0I?rel=0

                        Salt Water Remnants on Ceres
      Video Credit: [3]Dawn Mission, [4]NASA, [5]JPL-Caltech, [6]UCLA,
                                 MPS/DLR/IDA

   Explanation: Does Ceres have underground pockets of water? [7]Ceres,
   the largest asteroid in the [8]asteroid belt, was thought to be
   composed of rock and ice. At the same time, [9]Ceres was known to have
   unusual bright spots on its surface. These [10]bright spots were
   clearly imaged during Dawn's [11]exciting approach in 2015. Analyses of
   Dawn images and spectra indicated that the bright spots arise from the
   residue of highly-reflective salt water that used to exist on
   [12]Ceres' surface but evaporated. [13]Recent analysis indicates that
   some of this water may have originated from deep inside Ceres,
   indicating Ceres to be a kindred spirit with several [14]Solar System
   moons, also thought to harbor deep water pockets. The [15]featured
   video shows in false-color pink the bright evaporated brine named
   [16]Cerealia Facula in [17]Occator Crater. In 2018, the
   [18]mission-successful but [19]fuel-depleted Dawn [20]spacecraft was
   placed in a distant parking orbit, keeping it away from the Ceres'
   surface for at least 20 years to avoid interfering with any [21]life
   that might there exist.

    Experts Debate: [22]How will humanity first discover extraterrestrial
                                    life?
                       Tomorrow's picture: bonus moons
     __________________________________________________________________

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     __________________________________________________________________

    Authors & editors: [34]Robert Nemiroff ([35]MTU) & [36]Jerry Bonnell
                                 ([37]UMCP)
          NASA Official: Phillip Newman [38]Specific rights apply.
              [39]NASA Web Privacy Policy and Important Notices
                A service of: [40]ASD at [41]NASA / [42]GSFC
                           & [43]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://www.youtube.com/embed/ALaOGmu1S0I?rel=0
   3. https://dawn.jpl.nasa.gov/
   4. https://www.nasa.gov/
   5. https://www.jpl.nasa.gov/
   6. http://dawndata.igpp.ucla.edu/
   7. https://solarsystem.nasa.gov/planets/dwarf-planets/ceres/overview/
   8. https://starchild.gsfc.nasa.gov/docs/StarChild/solar_system_level1/asteroids.html
   9. https://apod.nasa.gov/apod/ap190616.html
  10. https://apod.nasa.gov/apod/ap150916.html
  11. https://www.youtube.com/watch?v=JrafypeEhTM
  12. https://en.wikipedia.org/wiki/Ceres_(dwarf_planet)#Observations_by_Dawn
  13. https://ui.adsabs.harvard.edu/abs/2020NatAs...4..786D/abstract
  14. https://apod.nasa.gov/apod/ap180701.html
  15. https://www.jpl.nasa.gov/news/news.php?release=2020-155
  16. https://apod.nasa.gov/apod/ap180719.html
  17. https://en.wikipedia.org/wiki/Occator_(crater)
  18. https://en.wikipedia.org/wiki/Dawn_(spacecraft)
  19. https://media1.tenor.com/images/fa0263f9f3ff39f44a58ccb3aae12439/tenor.gif
  20. https://www.nasa.gov/feature/jpl/the-legacy-of-nasa-s-dawn-near-end-of-mission
  21. https://earthsky.org/space/ceres-subsurface-salty-meltwater-deposits
  22. https://apod.nasa.gov/debate/debate100th.html
  23. https://apod.nasa.gov/apod/ap200831.html
  24. https://apod.nasa.gov/apod/archivepix.html
  25. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  26. https://apod.nasa.gov/apod/lib/aptree.html
  27. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  28. https://apod.nasa.gov/apod/calendar/allyears.html
  29. https://apod.nasa.gov/apod.rss
  30. https://apod.nasa.gov/apod/lib/edlinks.html
  31. https://apod.nasa.gov/apod/lib/about_apod.html
  32. http://asterisk.apod.com/discuss_apod.php?date=200901
  33. https://apod.nasa.gov/apod/ap200902.html
  34. http://www.phy.mtu.edu/faculty/Nemiroff.html
  35. http://www.phy.mtu.edu/
  36. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  37. http://www.astro.umd.edu/
  38. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  39. https://www.nasa.gov/about/highlights/HP_Privacy.html
  40. https://astrophysics.gsfc.nasa.gov/
  41. https://www.nasa.gov/
  42. https://www.nasa.gov/centers/goddard/
  43. http://www.mtu.edu/