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define('DISALLOW_FILE_MODS', true);{"id":1316,"date":"2006-12-21T12:41:30","date_gmt":"2006-12-21T11:41:30","guid":{"rendered":"http:\/\/tristan.ferroir.fr\/?p=1316"},"modified":"2012-03-21T12:42:07","modified_gmt":"2012-03-21T11:42:07","slug":"mineralogy-and-petrology-of-comet-81pwild-2-nucleus-samples","status":"publish","type":"post","link":"http:\/\/tristan.ferroir.fr\/index.php\/2006\/12\/21\/mineralogy-and-petrology-of-comet-81pwild-2-nucleus-samples\/","title":{"rendered":"Mineralogy and Petrology of Comet 81P\/Wild 2 Nucleus Samples"},"content":{"rendered":"<p>NEW PUBLICATION IN SCIENCE<\/p>\n<p>The bulk of the comet 81P\/Wild 2 (hereafter Wild 2) samples returned to Earth by the Stardust spacecraft appear to be weakly constructed mixtures of nanometer-scale grains, with occasional much larger (over 1 micrometer) ferromagnesian silicates, Fe-Ni sulfides, Fe-Ni metal, and accessory phases. The very wide range of olivine and low-Ca pyroxene compositions in comet Wild 2 requires a wide range of formation conditions, probably reflecting very different formation locations in the protoplanetary disk. The restricted compositional ranges of Fe-Ni sulfides, the wide range for silicates, and the absence of hydrous phases indicate that comet Wild 2 experienced little or no aqueous alteration. Less abundant Wild 2 materials include a refractory particle, whose presence appears to require radial transport in the early protoplanetary disk.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>NEW PUBLICATION IN SCIENCE The bulk of the comet 81P\/Wild 2 (hereafter Wild 2) samples returned to Earth by the Stardust spacecraft appear to be weakly constructed mixtures of nanometer-scale grains, with occasional much larger (over 1 micrometer) ferromagnesian silicates, &hellip; <a class=\"more-link\" href=\"http:\/\/tristan.ferroir.fr\/index.php\/2006\/12\/21\/mineralogy-and-petrology-of-comet-81pwild-2-nucleus-samples\/\">Lire la suite <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[54,90],"tags":[117],"_links":{"self":[{"href":"http:\/\/tristan.ferroir.fr\/index.php\/wp-json\/wp\/v2\/posts\/1316"}],"collection":[{"href":"http:\/\/tristan.ferroir.fr\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/tristan.ferroir.fr\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/tristan.ferroir.fr\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/tristan.ferroir.fr\/index.php\/wp-json\/wp\/v2\/comments?post=1316"}],"version-history":[{"count":2,"href":"http:\/\/tristan.ferroir.fr\/index.php\/wp-json\/wp\/v2\/posts\/1316\/revisions"}],"predecessor-version":[{"id":1319,"href":"http:\/\/tristan.ferroir.fr\/index.php\/wp-json\/wp\/v2\/posts\/1316\/revisions\/1319"}],"wp:attachment":[{"href":"http:\/\/tristan.ferroir.fr\/index.php\/wp-json\/wp\/v2\/media?parent=1316"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/tristan.ferroir.fr\/index.php\/wp-json\/wp\/v2\/categories?post=1316"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/tristan.ferroir.fr\/index.php\/wp-json\/wp\/v2\/tags?post=1316"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}