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 November 26
   [2]A dark and jagged hill is shown strewn with rocks. On the slope is a
    white foggy area that appears to emanate from a non-descript place on
         the rock face. Please see the explanation for more detailed
                                information.

                  A Dust Jet from the Surface of Comet 67P
              Image Credit: [3]ESA, [4]Rosetta, [5]MPS, OSIRIS;
                      UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA

   Explanation: Where do comet tails come from? There are no obvious
   places on the [6]nuclei of comets from which the [7]jets that create
   [8]comet tails emanate. In 2016, though, ESA's [9]Rosetta spacecraft
   not only imaged a [10]jet emerging from [11]Comet
   67P/Churyumov-Gerasimenko, but flew right through it. Featured is [12]a
   telling picture showing a [13]bright plume emerging from a small
   circular dip bounded on one side by a 10-meter high wall. Analyses of
   [14]Rosetta data show that the jet was composed of both dust and
   water-ice. The rugged but otherwise [15]unremarkable terrain indicates
   that [16]something likely happened far under the porous surface to
   create the plume. [17]This image was taken about two months before
   [18]Rosetta's mission ended with a controlled impact onto Comet 67P's
   surface.

                        Tomorrow's picture: eagle ray
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    Authors & editors: [30]Robert Nemiroff ([31]MTU) & [32]Jerry Bonnell
                                 ([33]UMCP)
          NASA Official: Phillip Newman [34]Specific rights apply.
              [35]NASA Web Privacy Policy and Important Notices
                A service of: [36]ASD at [37]NASA / [38]GSFC,
                         [39]NASA Science Activation
                           & [40]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2311/Jet67P_Rosetta_2048.jpg
   3. https://www.esa.int/
   4. https://rosetta.esa.int/
   5. https://www.mps.mpg.de/en
   6. http://www.planetary.org/multimedia/space-images/small-bodies/comets-visited-by-spacecraft-2014.html
   7. https://apod.nasa.gov/apod/ap150203.html
   8. https://apod.nasa.gov/apod/ap000413.html
   9. http://www.esa.int/Our_Activities/Space_Science/Rosetta/Europe_s_comet_chaser
  10. https://apod.nasa.gov/apod/ap151118.html
  11. https://en.wikipedia.org/wiki/67P/Churyumov–Gerasimenko
  12. https://www.esa.int/Our_Activities/Space_Science/Rosetta/Rosetta_finds_comet_plume_powered_from_below
  13. https://www.syfy.com/syfywire/a-plume-erupts-from-a-comet-pressured-from-below
  14. https://www.youtube.com/watch?v=nQ9ivd7wv30
  15. http://www.esa.int/spaceinimages/Images/2017/10/Comet_plume_in_context
  16. https://pbs.twimg.com/media/ETbE6XDU4AIvE1d.jpg
  17. https://www.mps.mpg.de/Rosetta-reveals-dust-jet
  18. https://apod.nasa.gov/apod/ap161001.html
  19. https://apod.nasa.gov/apod/ap231125.html
  20. https://apod.nasa.gov/apod/archivepix.html
  21. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  22. https://apod.nasa.gov/apod/lib/aptree.html
  23. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  24. https://apod.nasa.gov/apod/calendar/allyears.html
  25. https://apod.com/feed.rss
  26. https://apod.nasa.gov/apod/lib/edlinks.html
  27. https://apod.nasa.gov/apod/lib/about_apod.html
  28. https://asterisk.apod.com/discuss_apod.php?date=231126
  29. https://apod.nasa.gov/apod/ap231127.html
  30. http://www.phy.mtu.edu/faculty/Nemiroff.html
  31. http://www.phy.mtu.edu/
  32. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  33. http://www.astro.umd.edu/
  34. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  35. https://www.nasa.gov/about/highlights/HP_Privacy.html
  36. https://astrophysics.gsfc.nasa.gov/
  37. https://www.nasa.gov/
  38. https://www.nasa.gov/centers/goddard/
  39. https://science.nasa.gov/learners
  40. http://www.mtu.edu/