... OF VENTING AT THE SOUTH POLE OF ENCELADUSEvidence is mounting that the atmosphere of Enceladus, first detected by the Cassini ... findings from the close flyby of Enceladus by Cassini this past July ...
... FINDS RECENT, UNUSUAL GEOLOGY ON ENCELADUSNew detailed images taken by NASA's ... polar region of Saturn's moon Enceladus reveal distinctive geological ... youthful terrains of any seen on Enceladus. ...
... 15, 2008SATURN'S DYNAMIC MOON ENCELADUS SHOWS MORE SIGNS OF ACTIVITYPASADENA, ... scientists look at Saturn's small moon Enceladus, the more they find evidence of ... world. The most recent flybys ...
... GLOBAL OCEAN IN SATURN'S MOON ENCELADUSA global ocean lies beneath the ... Saturn's geologically active moon Enceladus, according to new research using ... seven years' worth of images of Enceladus ...
... Calif.IMAGE ADVISORY: April, 16, 2012 ENCELADUS AND TETHYS RAW IMAGE PREVIEW FROM ... unprocessed images of the icy moons Enceladus and Tethys during its course through ... seen on the Web.Cassini ...
... maneuvers over the surface of Enceladus to uncover as much as we can about ... enhanced what we already know about Enceladus' south polar environment and the ... jets. The sub-surface sources of Enceladus' ...
... knowledge of Saturn's active moon, Enceladus, that has set planetary exploration ... environment -- a habitat -- within Enceladus where, perhaps, a second genesis ... extensive is the water layer within ...
Captain's LogMarch 9, 2006Enceladus! Last November, special imaging sequences trained on Enceladus as it sat backlit by the sun revealed ... back in July as we buzzed the Enceladus surface. Many distinct ...
... southern tip of the small moon, Enceladus, was intoxicating and profoundly ... imaging team's observations of Enceladus' geysers and planned, along with ... sights on the geysering glory of Enceladus, ...
... acutely close flyby of the icy moon Enceladus. Another bold dip over the south pole of Enceladus on Halloween and another skillful ... another year before we encounter Enceladus up close again. The ...
Strange and beautiful.
The fountains seem suspended, like if they were not connected to the black disk of the surface. Is this the effect of Enceladus casting its shadow on the basis of the geysers?
And another question: do these jets "propel" - even slightly - Enceladus, and distort its orbit the tiniest bit? Being located in one specific spot and not compensated by other effects, on a very long period?
Or do these fractures and jets randomly migrate anyway, so their tiny effects - if any - is also randomised on the long run?
Fantastic set of images of Helene.
Do we know if the surface is dust covered or comosed of icy grains, possibly sourced from the geysers of Enceladus or Saturn's rings in general?
Also Helene is only slightly larger than the Mars moon Phobos. Helene generally lacks impact craters accenpt for the side that is leading. Phobos seen at this resolution would be heavily cratered & grooved. Helene appears to lack both. Perhaps Helenequakes from impacts triggers these landslides & erases craters??? The surface gravity cannot be any more than 1/1,500th that on Earth.
Andrew R Brown.
Mass concentrations is an interesting hypothesis. Any way to test any of this? i had not thought of unequal mass distributions as a posible cause of the "flow lines" (but i had thought perhaps they might be fingerprints of the "person" who made this snow ball. rather big hands. anything match in the FBI database?) i do see the resemblance to hair growth.
if the flow lines are ice from Enceladus, what colected that ice into lines? the most likely force i can think of is gravety.
I have not been here for a while. That is true, perhaps the flow lines could also indicate mass concentrations within Helene.
I also understood that the flow lines could also be from ice swept up from the geysers on Enceladus. The Tethys tojan moons Telesto & Calypso are also largely covered in fine ice & Calypso too shows hints of flowlines. Would be interesting to get a close up of Polydeuces if possible too, the other Dione trojan moon, the one that trails Dione. Polydeuces is only about 3.5 KM wide at most, so Helene is very much larger.
Another interesting mug shot of Helene, the leading Trojan moon of Dione. Helene is only 36 KM by 32 KM by 30 KM in size, where as Dione is 1,123 KM wide!!!! Mind you the trailling trojan moon Polydeuces is much smaller again, perhaps only 3 KM wide!!!!!!!!
What is interesting to see is that the three trojan moons seen up close to date (Helene for Dione as well as Telesto & Calypso for Tethys) is that thet all have smoother profiles & certainly Calypso & Helene display flow like features. Are they sweeping up ice crystals ejected from Enceladus's geysers???
Just to say that around perikrone today, there was a non targetted Mimas pass, as well as that of Enceladus & Helene shortly after. Looking forward to seeing those images, Cassini did not pass that close to any of them, but more than close enough to reveal much new data & views from differing vantage points, than ever before.
I agree with you, many of those craters are very Mimas like. I still think that Rhea is very unevolved, one of the largest, in fact potetially the second largest unevolved object in the entire Solar System, only the Jupiter moon Callisto taking # 1 in that list.
The similar sized Uranus moons Titania & Oberon are certainly far more evolved than Rhea, Titania has huge graben, possible frosting & a large smoother region with smaller & softened craters & Oberon although cratered, shows signs of cryovolcanism with many craters having dark floors, at least on huge chasm, many craters appear 'softened' like Enceladus, Dione, Miranda, Ariel, Titania, Triton & Ganymede, worlds that have been & some may, in the case of Enceladus & Triton still are geologically active.
Rhea shows none of that, a surface that is practically craters on craters on craters. Some faulting is present, but how much of that is due to the Tirawa Basin forming event or other impacts, remains to be seen. Rhea is certainly a relic from the earliest days, much to tell us about the history of the Kronian system ,regarding the environment this far out from the Sun & cratering rates of the Kronian system from the period shortly after the formative period. Rhea is fascinating, not so much because of Rhea itself, but because of what Rhea can tell us about the history of the Kronian system as a whole. Iapetus is another moon interesting for the same reason, aside from the huge mountain ridge, little else appears to have happened there either, Mimas too. Rhea is extremely photogenic too. It's an amazing surface visually, craters of differing shapes & sizes, some regions eppear more hilly than others, etc.
Yes they are Cosmic Rays @ the lower left.