Major discovery: Rhea has a ring.

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3488

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<p><font size="3" color="#993300"><strong>Wow major scoop here.&nbsp;</strong></font></p><p><font size="3" color="#993300"><strong>Rhea Saturn's second largest moon is the first&nbsp; moon to have been found to have its own ring system.</strong></font></p><p><strong><font size="3" color="#993300">Articles below.</font></strong></p><p>http://saturn.jpl.nasa.gov/news/press-release-details.cfm?newsID=820</p><p>http://photojournal.jpl.nasa.gov/catalog/PIA10246</p><p><font size="2" color="#333300"><strong>What else is going to be found this year?</strong></font></p><p><font size="2" color="#333300"><strong>&nbsp;What a week this is turning out to be.</strong></font></p><p><font size="3" color="#000080"><strong>Makes you wonder</strong></font> <img src="http://sitelife.space.com/ver1.0/Content/images/store/8/12/282a8466-ff9b-4ca2-bc55-f0cb89b76225.Medium.gif" alt="" />&nbsp; <font size="5" color="#800000"><strong>?</strong></font></p><p><strong><font size="2" color="#800000">Artists impression below.</font></strong></p><p><img src="http://sitelife.space.com/ver1.0/Content/images/store/13/8/7d558b93-30cd-487e-a89e-63661d82fc4a.Medium.jpg" alt="" /></p><p><font size="2" color="#800000"><strong>Andrew Brown.</strong></font></p> <div class="Discussion_UserSignature"> <p><font color="#000080">"I suddenly noticed an anomaly to the left of Io, just off the rim of that world. It was extremely large with respect to the overall size of Io and crescent shaped. It seemed unbelievable that something that big had not been visible before".</font> <em><strong><font color="#000000">Linda Morabito </font></strong><font color="#800000">on discovering that the Jupiter moon Io was volcanically active. Friday 9th March 1979.</font></em></p><p><font size="1" color="#000080">http://www.launchphotography.com/</font><br /><br /><font size="1" color="#000080">http://anthmartian.googlepages.com/thisislandearth</font></p><p><font size="1" color="#000080">http://web.me.com/meridianijournal</font></p> </div>
 
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derekmcd

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<p><font size="2">Fascinating.</font></p><p><font size="2">In the article, they state:&nbsp;</font></p><p><font size="2"><strong><font face="VERDANA,HELVETICA,ARIAL">"The existence of some debris was expected because a rain of dust constantly hits Saturn's moons, including Rhea, knocking particles into space around them.</font></strong>" </font></p><p><font size="2">What dust are they talking about? </font></p> <div class="Discussion_UserSignature"> <div> </div><br /><div><span style="color:#0000ff" class="Apple-style-span">"If something's hard to do, then it's not worth doing." - Homer Simpson</span></div> </div>
 
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silylene

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<p><BR/>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'><font color="#ff0000">Wow major scoop here.&nbsp;Rhea Saturn's second largest moon is the first&nbsp; moon to have been found to have its own ring system.Articles below.http://saturn.jpl.nasa.gov/news/press-release-details.cfm?newsID=820http://photojournal.jpl.nasa.gov/catalog/PIA10246What else is going to be found this year?&nbsp;What a week this is turning out to be.Makes you wonder &nbsp; ?Artists impression below.Andrew Brown. <br />Posted by <strong>3488</strong></font></DIV><br /><br />I wonder how much mass is in this purported 'ring' around Rhea?</p><p>ANd, if this ring were to collapse and create a circumferential ridge (a la Iapteus), how high would the ridge be?</p><p>(formerly known as 'silylene' before my handle was vaporized)</p> <div class="Discussion_UserSignature"> <p align="center"><font size="1">petet = <font color="#800000"><strong>silylene</strong></font></font></p><p align="center"><font size="1">Please, please give me my handle back !</font></p> </div>
 
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3488

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<p><BR/>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'><font color="#ff0000">Fascinating.In the article, they state:&nbsp;"The existence of some debris was expected because a rain of dust constantly hits Saturn's moons, including Rhea, knocking particles into space around them." What dust are they talking about? <br />Posted by derekmcd</font></DIV></p><p><font size="2" color="#800000"><strong>Hi derekmcd,</strong></font></p><p><font size="2" color="#800000"><strong>I wonder if the rings formed from the Tirawa Basin impact event? See link below.</strong></font></p><p>&nbsp;http://photojournal.jpl.nasa.gov/catalog/PIA08976</p><p><font size="2" color="#0000ff"><strong>BTW, I am somewhat blown away by your comments about me & the image threads I sometimes do.</strong></font></p><p><font size="2" color="#0000ff"><strong>Don't fear, there will be others.</strong></font></p><p><font size="2" color="#333300"><strong>Tonight SDC appears to be working OK on my home computer. Last night, it was a nightmare, so some improvement here has been made. </strong></font></p><p><font size="2" color="#0000ff"><strong><img src="http://sitelife.space.com/ver1.0/Content/images/store/0/1/4035cdc0-d52d-49ec-a181-cd8603bb8333.Medium.gif" alt="" /></strong></font></p><p><font size="2" color="#0000ff"><strong><font color="#800000">Last night felt like doing this</font>: <img src="http://sitelife.space.com/ver1.0/Content/images/store/6/4/c63a6f2b-8f28-42e4-b40d-6ee9fc498a69.Medium.gif" alt="" /><br /><br /><br /></strong></font><font size="2" color="#0000ff"><strong>Just what a week this is turning out to be.</strong></font></p><font size="2" color="#993300"><strong>Andrew Brown.</strong></font><font size="2" color="#0000ff"><strong> </strong></font> <div class="Discussion_UserSignature"> <p><font color="#000080">"I suddenly noticed an anomaly to the left of Io, just off the rim of that world. It was extremely large with respect to the overall size of Io and crescent shaped. It seemed unbelievable that something that big had not been visible before".</font> <em><strong><font color="#000000">Linda Morabito </font></strong><font color="#800000">on discovering that the Jupiter moon Io was volcanically active. Friday 9th March 1979.</font></em></p><p><font size="1" color="#000080">http://www.launchphotography.com/</font><br /><br /><font size="1" color="#000080">http://anthmartian.googlepages.com/thisislandearth</font></p><p><font size="1" color="#000080">http://web.me.com/meridianijournal</font></p> </div>
 
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3488

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<p><font color="#ff0000"><BR/>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>I wonder how much mass is in this purported 'ring' around Rhea?ANd, if this ring were to collapse and create a circumferential ridge (a la Iapteus), how high would the ridge be?(formerly known as 'silylene' before my handle was vaporized) <br />Posted by petet</DIV></font></p><p><font size="2" color="#800000"><strong>Hi silylene,</strong></font></p><p><font size="2" color="#800000">Quote from the Cassini site"<em><font color="#000080">Rhea is roughly 1,500 kilometers (950 miles) in diameter. The apparent debris disk measures several thousand miles from end to end. The particles that make up the disk and any embedded rings probably range from the size of small pebbles to boulders. An additional dust cloud may extend up to 5,900 kilometers (3,000 miles) from the moon's center, almost eight times the radius of Rhea<font color="#800000">".&nbsp;</font></font></em></font></p><p><font size="2" color="#800000">It does not say how thick it is. How ever, it support's the idea that the Voyager Mountains on Iapetus are made of a collapsed ring.</font><font size="+0"><font size="2" color="#800000">&nbsp;</font></font></p><p><font color="#003300"><font size="+0"><font size="2">The observations were made in November 2005, so I suspect the existence of the ring is confirmed, hence the announcement being made only now, so they have been very cautious.</font></font></font></p><p><font color="#003300"><font size="+0"><font size="2" color="#800000">I wonder if long duration exposures of Rhea, by Cassini&nbsp;will show it / them?<br /></font></font><br /></font><font color="#333300"><strong>Andrew Brown.</strong></font></p> <div class="Discussion_UserSignature"> <p><font color="#000080">"I suddenly noticed an anomaly to the left of Io, just off the rim of that world. It was extremely large with respect to the overall size of Io and crescent shaped. It seemed unbelievable that something that big had not been visible before".</font> <em><strong><font color="#000000">Linda Morabito </font></strong><font color="#800000">on discovering that the Jupiter moon Io was volcanically active. Friday 9th March 1979.</font></em></p><p><font size="1" color="#000080">http://www.launchphotography.com/</font><br /><br /><font size="1" color="#000080">http://anthmartian.googlepages.com/thisislandearth</font></p><p><font size="1" color="#000080">http://web.me.com/meridianijournal</font></p> </div>
 
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vogon13

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<p>The referenced article says they did an imaging search with Rhea visually near the sun at the time of the observation.&nbsp; This is an extremely sensitive test for seeing dust etc. illumined by the sun.</p><p>&nbsp;</p><p>And the article indicates the result was negative for imaging ''rings'.</p><p>&nbsp;</p><p>Whatever we are discussing here in the electron density findings is not even remotely what I (and I can't help but think most others who study such things) would call <em><strong>rings</strong></em>.</p><p>&nbsp;</p><p>Rings, while maybe not rigidly defined by anything more vigorous than "I knows 'em when I sees 'em" is emphatically what we are <em><strong>not</strong></em> seeing here.</p><p>&nbsp;</p><p>What ever it is, I admit is very interesting, but the negative imaging results, particularly with the referenced sun geometry, precludes anything, in my view, that I would call 'rings'.</p><p>&nbsp;</p><p>&nbsp;</p><p>&nbsp;</p> <div class="Discussion_UserSignature"> <p><font color="#ff0000"><strong>TPTB went to Dallas and all I got was Plucked !!</strong></font></p><p><font color="#339966"><strong>So many people, so few recipes !!</strong></font></p><p><font color="#0000ff"><strong>Let's clean up this stinkhole !!</strong></font> </p> </div>
 
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derekmcd

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<p><strong><BR/>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>Hi derekmcd,I wonder if the rings formed from the Tirawa Basin impact event?<br /><br /> Posted by 3488</DIV></strong></p><p>Planetary science is not something i keep up on, but this idea makes sense to me.&nbsp; The "raining dust" doesn't.&nbsp; I'm curious as to what makes the scientist believe that.&nbsp; Where does this dust come from?&nbsp;</p><p><strong>&nbsp;</strong></p><p><strong>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>I am somewhat blown away by your comments about me & the image threads I sometimes do.</strong></p><p><strong> Posted by 3488</DIV></strong><br /></p><p><br />I'm fairly confident I am not the only one on this forum that has that sentiment.&nbsp; If I didn't mention it, I'm sure someone else would have.</p><p>I believe someone else mentioned the size of the pictures allowed and referred to you also after I did in a different thread.</p><p>You might be humble, but don't be suprised how many folks here appreciate the awe inspiring photos you post.</p><p>I'm glad ya stuck around... I think the SDC forums will survive the change.&nbsp;</p> <div class="Discussion_UserSignature"> <div> </div><br /><div><span style="color:#0000ff" class="Apple-style-span">"If something's hard to do, then it's not worth doing." - Homer Simpson</span></div> </div>
 
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