       APOD: 2017 November 6 - A Dust Jet from the Surface of Comet 67P

                         Astronomy Picture of the Day

    Discover the cosmos! [1] Each day a different image or photograph of our
 fascinating universe is featured, along with a brief explanation written by a
                           professional astronomer.

                                2017 November 6
                                      [2]
                  A Dust Jet from the Surface of Comet 67P
      Image Credit & Copyright: ESA [3] , Rosetta [4] , MPS [5] , OSIRIS;
                      UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA

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

                      Tomorrow's picture: clock wall [19]

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    Authors & editors: Robert Nemiroff [31] (MTU [32] ) & Jerry Bonnell [33]
                                  (UMCP [34] )
          NASA Official:  Phillip Newman Specific rights apply [35] .
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              A service of: ASD [37]  at NASA [38]  / GSFC [39]
                           & Michigan Tech. U. [40]
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Site notes:
  [1] archivepix.html
  [2] image/1711/Jet67P_Rosetta_2048.jpg
  [3] http://www.esa.int/
  [4] http://rosetta.esa.int/
  [5] http://www.mps.mpg.de/en
  [6]
http://www.planetary.org/multimedia/space-images/small-bodies/
comets-visited-by-spacecraft-2014.html
  [7] ap150203.html
  [8] ap000413.html
  [9]
http://www.esa.int/Our_Activities/Space_Science/Rosetta/Europe_s_comet_chaser
  [10] ap151118.html
  [11] https://en.wikipedia.org/wiki/67P/Churyumov%E2%80%93Gerasimenko
  [12]
http://www.esa.int/Our_Activities/Space_Science/Rosetta/
Rosetta_finds_comet_plume_powered_from_below
  [13]
http://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] http://www.dvsjr.com/Home-alone-dog-destroys-toilet-paper.jpg
  [17] http://www.mps.mpg.de/Rosetta-reveals-dust-jet
  [18] ap161001.html
  [19] ap171107.html
  [20] ap171105.html
  [21] archivepix.html
  [22] lib/apsubmit2015.html
  [23] lib/aptree.html
  [24] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  [25] calendar/allyears.html
  [26] /apod.rss
  [27] lib/edlinks.html
  [28] lib/about_apod.html
  [29] http://asterisk.apod.com/discuss_apod.php?date=171106
  [30] ap171107.html
  [31] http://www.phy.mtu.edu/faculty/Nemiroff.html
  [32] http://www.phy.mtu.edu/
  [33] https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  [34] http://www.astro.umd.edu/
  [35] lib/about_apod.html#srapply
  [36] https://www.nasa.gov/about/highlights/HP_Privacy.html
  [37] https://astrophysics.gsfc.nasa.gov/
  [38] https://www.nasa.gov/
  [39] https://www.nasa.gov/centers/goddard/
  [40] http://www.mtu.edu/
