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新研究确认地球上最古老的固体物质
source link: https://tech.sina.com.cn/d/s/2020-01-15/doc-iihnzhha2626815.shtml
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新华社华盛顿1月13日电（记者周舟）一个国际研究团队在陨石中发现了地球上已知最古老的固体物质——50亿至70亿年前形成的星尘，比太阳还要古老。恒星由宇宙中的尘埃与气体聚集而成，其死亡后会释放出星尘，后者又形成新的恒星、行星、卫星和陨石。美国
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