Mineralogy and Petrology of Comet 81P/Wild 2 Nucleus Samples

書誌事項

公開日
2006-12-15
DOI
  • 10.1126/science.1135842
公開者
American Association for the Advancement of Science (AAAS)

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説明

<jats: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.</jats:p>

収録刊行物

  • Science

    Science 314 (5806), 1735-1739, 2006-12-15

    American Association for the Advancement of Science (AAAS)

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