隼鸟2号探测器

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“龙宫”小行星母天体上存在冰的时间超过10亿年
Xin Hua She· 2025-09-12 02:20
此前研究发现,碳质小行星诞生后数百万年间,上面的冰融化形成的水和岩石发生反应,形成含水矿 物。像现在"龙宫"的样本中所含水几乎全部是以含水矿物的羟基的形式存在。那么,含水矿物以外的水 在碳质小行星上存在多久,这些水此后又是如何消失的呢? 新华社东京9月12日电(记者钱铮 梁晨)日本东京大学、海洋研究开发机构等11日联合发布新闻公报 说,对采自"龙宫"小行星的岩石样本进行分析后发现,"龙宫"母天体上曾有以冰的形式存在的水,并且 冰存在的时间超过10亿年。 这为研究碳质小行星化学组成的变化、轨道的变迁、地球水的起源等提供了重要线索。相关论文已发表 在新一期英国《自然》杂志上。 学界有观点认为,由冰、有机物和矿物尘埃积聚形成的原始碳质小行星在约45.6亿年前诞生于太阳系外 侧,其中的一部分后来移动到太阳系内侧,给地球带来水和碳等物质。碳质小行星的碎片现在还会以陨 石的形式掉落到地球上。 东京大学领衔的国际团队开展了这项研究。据公报介绍,日本"隼鸟2"号探测器探测并采样的"龙宫"是 一颗直径约1千米的碳质小行星,是其母天体被别的天体撞击解体、碎片聚集在一起形成的。母天体就 是个头更大的碳质小行星。 本项研究中,研究团 ...
日团队首次测定小行星“龙宫”原材料物质形成时间
Xin Hua She· 2025-07-18 07:49
Group 1 - The research team led by Hokkaido University has successfully determined the formation time of the materials constituting the asteroid "Ryugu," which is approximately 4.5673 billion years ago, shortly after the birth of the solar system [1][2] - The study indicates that the original solid materials of celestial bodies provide crucial insights into their origins, with previous analyses showing that the minerals from "Ryugu" were formed around 4.562 billion years ago from low-temperature aqueous solutions [1] - The research utilized scanning electron microscopy to analyze "Ryugu" samples, revealing the presence of calcium-aluminum inclusions formed in high-temperature regions exceeding 1000 degrees Celsius in the early solar system [2] Group 2 - The study found that the sizes of calcium-aluminum inclusions in "Ryugu" rock samples are generally below 0.1 millimeters, while those in other carbonaceous chondrites are relatively larger, suggesting a connection to the transport processes of early solar system solid materials [2] - This discovery provides valuable data for understanding the origins of the solar system and planet formation, potentially advancing related research [2]