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<p><span style="font-family:Verdana">WASHINGTON</span><span style="font-family:Verdana"> -- NASA will host a media teleconference Thursday, July 3, at </span><span style="font-family:Verdana">2 p.m. </span><span style="font-family:Verdana">EDT</span><span style="font-family:Verdana">, to discuss analysis of data from the Mercury Surface, Space Environment, Geochemistry and Ranging (MESSENGER) spacecraft's flyby of Mercury earlier this year. <br /><br />The spacecraft is the first designed to orbit the planet closest to the sun. It flew past Mercury on </span><span style="font-family:Verdana">Jan. 14, 2008</span><span style="font-family:Verdana">, and made the first up-close measurements since Mariner 10's final flyby in 1975. <br /><br />Analyses of the data show volcanoes were involved in the formation of plains. The data also suggest the planet's magnetic field is actively produced in its core. In addition, the mission has provided the first look at the chemical composition of Mercury's surface. The results will be reported in a series of 11 papers published July 4 in a special section of Science magazine</span></p><span style="font-family:Verdana"><span style="font-family:Verdana"><font color="#800080">http://www.nasa.gov/home/hqnews/2008/jul/HQ_M08128_MESSENGER_update.html</font></span></span> <div class="Discussion_UserSignature"> Ron Bennett </div>