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<p><font size="4"> Four image panel of newly imaged terrain in January 2008 during the first MESSENGER pass.</font></p><p><font size="2"><strong>Four very different terrains. Shield volcano, with 25 KM wide heart shaped caldera in SW Caloris, 125 KM wide <span class="smallDescriptionText">25-kilometer diameter impact Emines</span>cu Crater with terracing & a central circular ring peak, Pantheon Fossae (formally The Spider), collapsed lava tubes or localised graben & an lava flooded 40 KM wide crater with extentional faulting, one of the many Rupes on Mercury.</strong></font></p><p><font size="2"><strong>Will this second pass over the opposite hemisphere reveal more unexpected features.</strong></font><br /><br /> <img src="http://sitelife.space.com/ver1.0/Content/images/store/15/13/4fe103e5-977f-4200-9d03-9572ad47e40f.Medium.jpg" alt="" /><br /> </p><p><font size="2"><strong>Tracking will reveal more about the internal density & mass distribution, perhaps even confirming as suspected if mercury like Earth & the Jupiter moon Ganymede has a dual layered core (inner & outer cores).<br /><br /> During the first pass with the radar, it was suggested the average elevation on Mercury rose as MESSENGER passed from West to East. If Mercury is slightly egg shaped, then the radar should notice this time the average elevation descending as MESSENGER passes from West to East.<br /><br /> This is going to be one hell of a fascinating encounter.</strong></font></p><p><strong><font size="2">Countdown to 2nd closest approach: Monday 6th October 2008. <br /><br />4 Days. <br />10 Hours. <br />57 Minutes. <br />45 Seconds.</font></strong></p><p><font size="2"><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>