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Titan's seas got names: They are now on known as Kraken Mare and Ligeia Mare. The large island in Kraken Mare is Mayda Insula.
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Science is a way of trying not to fool yourself. The first principle is that you must not fool yourself, and you are the easiest person to fool. -- Richard Feynman |
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The impossible often has a kind of integrity which the merely improbable lacks. |
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Mapping Icy Moons
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Everything I need to know I learned through Googling. |
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![]() See the bands? Kinda like the familiar gas and ice giants? This is... Titan. Planetary Photojournal: Banded Moon Quote:
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Does anybody really understand why some planets exhibit atmospheric Super-rotation? It somehow seems counter intuitive, unless the larger host’s (Sun for Venus, Saturn for Titan) tidal rotation transfer is somehow creating this effect. Impressive that Titan's atmosphere does this too.
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Email from Carolyn Porco:
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Everything I need to know I learned through Googling. |
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Planetary Society News: Cassini to Shoot Past Enceladus for Its Fifth Close Encounter
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Sunday August 10 2340 PDT Monday August 11 0240 EDT Monday August 11 0640 UTC Closest Approach Monday August 11 1406 PDT Monday August 11 1706 EDT Monday August 11 2106 UTC Timeline, times UTC Quote:
16 hours to closest approach
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NASA Cassini Blog (August 8, Carolyn Porco):
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NASA Cassini Mission News: Cassini Prepares to Swoop by Saturn's Geyser-Spewing Moon Quote:
Monday August 11 1406 PDT Monday August 11 1706 EDT Monday August 11 2106 UTC 3 hours to closest approach
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NASA Cassini Blog: Cassini Calls Home! (Todd Barber, Cassini Lead Propulsion Engineer)
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Emily Lakdawalla is building Cassini ISS images of Enceladus from the Rev 80 (August 11, 2008) Targeted Flyby that associates raw images with planned image sequences mapped onto a whole Enceladus. When the images are filled in, you'll be able to quickly tell the context of what you're looking at. Just a few have been downloaded as of this posting.
Cassini current raw images is beginning get some images from the flyby, like this: (The line truncation, missing ends of alternate lines on the right of images, is normal and a way of getting something that is better than nothing. Raw Image FAQ) Oh, here's a goood one: ![]() Too bad it's an artist's impression.
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So, what's the lump, the polyp, on Enceladus, in this raw image ID 165909, middle left side:
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Emily Lakdawalla's cleaned up, rotated version From the size of its shadow it's by far the tallest thing in the neighborhood. Oh, the Planetary Society Weblog: More Enceladus image fun, asks, too: Quote:
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It looks like it came out of the ground vertically and fell over to lay on top of the surrounding ground. Awesome photo, its a shame the "base" of polyp is still obscured by the interlacing. Will that be processed away eventually?
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I think its an empty coke bottle, buried in the sand, probably by one of those aliens with the beach buggies, that left all those tire marks behind.
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At night the stars put on a show for free (Carole King) One Earth, One Sky - IYA 2009 All moderation in purple |
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As I understand it, that interlacing effect is Cassini's way of doing data compression and maintaining high-frequency information. Each image is preallocated a certain amount of space, so they can plan long data sequences and not completely lose data. So if there is more detail than expected in some sense, it makes up for that by leaving out part of every other line. There are various ways to improve the appearance (like interpolation), but the actual data values are not there.
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NASA Cassini-Huygens Mission News: Cassini Pinpoints Source of Jets on Saturn's Moon Enceladus
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The feature I find interesting is the large circular area centered just beneath VIII (hot zone B) that predates and lies beneath Cairo and possibly predates all the tiger stripes. It resembles a large impact crater possibly presenting a different thermal history from other impacts on the moon.
The image, while from an earlier pass, came up from a recent New Scientist reprise of current events: http://space.newscientist.com/data/i...4553-4_600.jpg Another question is whether the 10 meter ice blocks can have a half life that can get them back to the formation time of the tiger stripes or whether they are constrained to more recent events. How old can these blocks be? |
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Beautiful mosaic from the Enceladus encounter
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Cassini flies within 25 kilometers of Enceladus tomorrow.
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Science is a way of trying not to fool yourself. The first principle is that you must not fool yourself, and you are the easiest person to fool. -- Richard Feynman |
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I wonder if onboard instuments can sort out if some of the particles monitored will have an isotope signature consistent with a radiogenic heat source for the plumes. If the tiger stripes are geologically young compared to underlying features, one must endeavor to discover what is the recent cause of the stripes and plumes that make the E-ring. Most of the theories that look to frictional or tidal influences or differentiation due to Al26 will eventually need to address the coincidence problem posed by young tiger stripes.
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I sort of dozed off concerning Cassini!
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In your rush to call everyone "entrenched" or closed-minded or "limited" you fail to note that the "limit" here has a very natural boundary: that point at which the evidence stops. - JayUtah Science fiction was never meant to be an educational tool. - Editor Amazing Tales |
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Planetary Society Weblog: Cassini flies within 25 kilometers of Enceladus tomorrow
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2008 October 09, 1207 PDT, Friday 2008 October 09, 1507 EDT, Friday 2008 October 09, 1907 UTC, Friday 15-1/2 hours to closest approach
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NASA Cassini Mission News Release: Cassini Finds Enceladus Tiger Stripes are Really Cubs Quote:
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Thanks for looking up the references.
The issue of crystalline ice speaks to the age of the most recent eruptions of plumes from the stripes rather than the age of the stripes themselves. We know the ice is fresh now because Cassini has actually monitored plume activity. The short lifetime of crystalline ice in Saturn's high radiation environement is going to be significantly shorter than if Enceladus was nowhere near the planet. Even then the lifetime would only be about a million years as cosmic radiation serves to transform it into amorphous ice. The issue of the actual age of the stripes, however, can not be determined from the age of crystal ice. All that can be sorted out is that it has been recently active from crystalline ice. To constrain the age of the stripes themselves, one needs to constrain the age of features that underly and so predate the stripes. As mentioned in a post above, I found the "fingerprint-like" terrain beneath the stripes to be an interesting feature that itself might point to a limitation or constraint upon the age of the "fingerprint" terrain. This would then place an upper limit on the age of the Tiger Stripes themselves regardless of how recent the plumes were active. It is this age that could present a coincidence problem for many of the various theories presently put forth to address the heat or liquid ocean ideas. Why now, more recently, and not for billions of years? Certainly friction and tidal and any heat from differentiation would have made an imprint older than the stripes. They should have been there from the start and not a recent geological feature. They should predate the "fingerprint" terrain. |
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Borman, I'm not sure I follow you. The 'ocean' is purely speculative, but the fact that enceladus is warmer than it should be is a measured fact, not an idea. All the mechanisms put forward to explain this have holes in them. One of the most recurring ones being 'Why would this be active now?' as you point out.
Whatever we come up with to explain this needs to explain why the heat and geysers occur in this period of time, and it sounds a little like you've got an idea of your own....?
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For me it's enough for the garden to be beautifull; why do so many want to see fairies at the bottom? "Many of those people are not getting four when adding two and two; many of them aren't even getting five or twenty-two. They're getting potato." Gillianren |
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