Enceladus @ AGU - Unmanned Spaceflight.com

Enceladus @ AGU

volcanopele View Member Profile	Dec 15 2008, 09:03 PM Post #1
Senior Member Group: Moderator Posts: 3242 Joined: 11-February 04 From: Tucson, AZ Member No.: 23	There was a news briefing at AGU this afternoon covering the results of the Enceladus flybys this fall: Saturn's Dynamic Moon Enceladus Shows More Signs of Activity http://saturn.jpl.nasa.gov/news/press-rele....cfm?newsID=889 The imaging team has released several image products showcasing the results from the encounter: http://ciclops.org/view_event/98/Enceladus_Shifting_Terrain I do hope you all enjoy the two large mosaics that accompany this image release: Tiger Stripes...Magnified! http://ciclops.org/view/5409/Tiger_StripesMagnified http://photojournal.jpl.nasa.gov/catalog/PIA11135 A Tectonic Feast http://ciclops.org/view/5310/A_Tectonic_Feast http://photojournal.jpl.nasa.gov/catalog/PIA11133 I guess the big results from ISS is the "new" theory that the tiger stripes are analogous to the mid-ocean ridges on earth, spreading centers that act as axes where new terrain is produced. -------------------- &@^^!% Jim! I'm a geologist, not a physicist! The Gish Bar Times - A Blog all about Jupiter's Moon Io

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dvandorn View Member Profile	Dec 16 2008, 05:32 AM Post #2
Senior Member Group: Members Posts: 3419 Joined: 9-February 04 From: Minneapolis, MN, USA Member No.: 15	If Enceladus' crust is actively spreading, then either 1) the entire moon is expanding, or 2) it has subduction zones. Where would any of y'all think the subduction zones are located? Also, doesn't subduction and surface spreading absolutely require a soft mantle upon which the crust floats? Where is all the heat coming from to keep Enceladus everything from molten (at the core, and by that I mean liquid water) to very elastic in the mantle? Suppositions, anyone? (For myself, I wonder if there's any way that Enceladus could have been impacted by an extrasolar AL26 mass sometime within the last several thousand years, which could be powering a short-term period of activity within the moon...) -the other Doug -------------------- “The trouble ain't that there is too many fools, but that the lightning ain't distributed right.” -Mark Twain

Posts in this topic

volcanopele Enceladus @ AGU Dec 15 2008, 09:03 PM

belleraphon1 Absolutely beautiful .... not just the imaging, bu... Dec 15 2008, 11:32 PM

dvandorn If Enceladus' crust is actively spreading, the... Dec 16 2008, 05:32 AM

volcanopele The spreading is likely compensated via compressio... Dec 16 2008, 06:08 AM

Floyd dvandorn Where is all the heat coming from to keep... Dec 16 2008, 06:52 PM

Doc Yes, that paper was out a while ago and neatly exp... Dec 17 2008, 10:37 AM

dvandorn Exactly, Doc. There are limits to the compressibi... Dec 17 2008, 03:52 PM

Floyd How about compression with fracturing with ice mov... Dec 17 2008, 06:26 PM

Phil Stooke "how exactly does compression compensate for ... Dec 17 2008, 06:35 PM

Juramike Tectonic compression, a blue-white impression ice... Dec 17 2008, 07:05 PM

Doc Please enlighten us Phil. To tell you the truth th... Dec 17 2008, 07:20 PM

Juramike I think the Ganymede grooved terrain was predicted... Dec 18 2008, 04:15 AM

Fran Ontanaya Q. Does the surface ice become amorphous due to th... Dec 18 2008, 05:11 PM

Doc QUOTE (Fran Ontanaya @ Dec 18 2008, 08:11... Dec 18 2008, 05:24 PM

Fran Ontanaya But even if the 'accordion' terrain doesn... Dec 18 2008, 06:23 PM

Doc I would expect the ice to melt in the relatively w... Dec 18 2008, 07:03 PM

Juramike I'm really not sure but... At the center of t... Dec 18 2008, 07:09 PM

Doc Bingo Mike! I think you can call that subducti... Dec 18 2008, 09:23 PM

dvandorn When I finally figured out (with Phil's apprec... Dec 19 2008, 05:51 AM

scalbers Perhaps I should simply study the video more and s... Dec 20 2008, 10:11 PM

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