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A chip off the old block

机译:一个模子出来的

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摘要

Not since NASA's scientists definitively announced that the lunar white stuff was non-dairy has the Moon faced such an identity crisis. Ironically, it seems that our satellite is compositionally too similar to Earth for a simple explanation of its origins. Most dynamical and even some chemical attributes of the Earth-Moon system have been successfully explained by a 'giant impact' scenario, in which a Mars-sized impactor collided with the proto-Earth. Yet the standard version of this model produces a Moon that is mainly made of the impactor and not the target (Fig. 1). As emphasized in a Royal Society meeting in September that debated the origin of the Moon, the compositional differences between Earth and the Moon that would be expected as a consequence are increasingly at odds with diverse,high-precision isotopic observations.
机译:自从美国宇航局的科学家明确宣布月球白色物质不是乳制品以来,月球就面临这样的身份危机。具有讽刺意味的是,似乎我们的卫星在结构上与地球太相似,无法简单解释其起源。地球-月球系统的大多数动力学特性,甚至是某些化学特性,已通过“巨大撞击”场景成功解释,在这种场景中,火星大小的撞击器与原始地球相撞。然而,该模型的标准版本会产生一个主要由撞击器而不是目标制成的月球(图1)。正如在9月举行的辩论月球起源的皇家学会会议上所强调的那样,因此,人们期望地球与月球之间的成分差异与各种高精度同位素观测结果越来越不一致。

著录项

  • 来源
    《Nature》 |2013年第7478期|90-90|共1页
  • 作者

    TIM ELLIOTT;

  • 作者单位

    School of Earth Sciences,University of Bristol, Bristol BSB 1RJ, UK;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
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