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Astromaterials Research of Comet Wild 2: Terameters to Nanometers

机译:野外彗星2:兆米至纳米的天体材料研究

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摘要

Stardust, a NASA sample return mission, safely landed in the Utah desert in January 2006 after a seven-year mission, bringing with it the first cometary material from a known parent source, Comet 81 P/Wild 2. One of the mission goals is to determine the starting material of the solar system. By sampling a comet, which has spent most of the past 4.6 Gyr beyond the orbit of Neptune, we expect to measure material presumed to be unaffected by the ignition of the sun. The Stardust spacecraft swept through the tail of the comet, collecting hundreds of micron-sized particles from that stream into aerogel, a low-density silica foam. An international team of materials scientists have studied the mineralogy, petrology, and elemental and isotopic abundance of these materials. Our group has studied elemental abundance using an x-ray microprobe; the morphology of the particles was examined using an x-ray microscope, which enables nanotomography of the particles while encased in aerogel. The unexpected conclusions are that much of the material from this comet was formed near the sun, after its ignition, and soon thereafter transported to the outer reaches of the solar system. These results have changed the way astrophysicists think about solar system formation.
机译:NASA样本返回任务“星尘”在进行了7年的任务之后,于2006年1月安全降落在犹他州沙漠中,并带来了来自已知父源彗星81 P / Wild 2的第一批彗星材料。确定太阳系的起始材料。通过对一颗彗星进行采样,该彗星在过去的4.6吉尔的大部分时间里都位于海王星的轨道之外,因此,我们预计将测量假定不受太阳点火影响的物质。星尘号飞船扫过彗星的尾巴,从流中收集了数百微米大小的颗粒,进入了低密度硅胶泡沫气凝胶。一个国际材料科学家团队研究了这些材料的矿物学,岩石学以及元素和同位素的丰度。我们的小组使用X射线微探针研究了元素丰度;使用X射线显微镜检查了颗粒的形态,该显微镜可以将颗粒包裹在气凝胶中,并进行纳米层析。出乎意料的结论是,这颗彗星的许多物质是在太阳点燃后在太阳附近形成的,并很快被输送到太阳系的外围。这些结果改变了天体物理学家对太阳系形成的思考方式。

著录项

  • 来源
    《MRS bulletin》 |2010年第2期|150-154|共5页
  • 作者

    Sean Brennan;

  • 作者单位

    Stanford Linear Accelerator Center's National Accelerator Laboratory P.O. Box 620757,Woodside, CA 94062,USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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