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社评“老太太XXX”-知识课堂

月球年龄被“整老太太XXX容”掩盖?国际最新研究称约在45.1亿年前形成

来源: 北京商报
2024-12-19 18:41:48

最佳回答

“老太太XXX”月球年龄被“整老太太XXX容”掩盖?国际最新研究称约在45.1亿年前形成

  中新老太太XXX网北京12月19日电 (记者老太太XXX 孙自法)作为人类生活的地球的一颗天然卫星,月球相关研究一直广受关注,其中,月球年龄问题也是争议焦点之一。

  国际学术期刊《自然》最新发表一篇天文学论文称,研究人员发现支持月球年龄更老的证据,指出月球形成时间大约在45.1亿年前。这项新分析显示,约43.5亿年前月球表面的“再熔融”过程,或许掩老太太XXX盖了月球一段更古老的历史。

资料图:中秋节夜空的圆月。中新网记者 孙自法 摄

  该论文介绍,一般认为,月球是在早期地球与一个火星大小的原行星相撞(影响地球历史的最后一次大撞击事件)后形成的。对该事件发生时间的估算是基于对月球岩石样品的测年,这些岩石样品据推断是从撞击后存在的月球岩浆海中结晶形成的,如此推算出月球的年龄在43.5亿年左右。不过,这个年龄无法解释热力模型与其他证据之间的多个差异,如月球上环形山的数量以及月球表面部分锆石矿物的年龄,这些证据显示月球的年龄可能高达45.1亿年。

  在本项研究中,论文第一作者兼通讯作者、美国加州大学圣克鲁斯分校Francis Nimmo和德国、法国同行合作研究指出,频繁出现的约43.5亿年历史的岩石或许指向一次由月球轨道演化驱动的再熔融事件,而非首次月球岩浆海凝固。

  他们利用建模研究证明,月球可能经历了充足的潮汐加热,导致了约43.5亿年前的这次类似为月表“整容”的再熔融事件,这可能“重置”了这些月球样品的表面形成年龄。此外,月球再熔融事件或许解释了为何早期撞击形成的月球撞击盆地比预计的要少,因为这些盆地可能在加热事件中被抹去了。

  论文作者总结推断,他们最新研究的这种解释,或许表明月球形成时间在44.3亿至45.3亿年前,达到了之前对月球年龄估算的上限。该研究见解有助于人们将对月球形成的理解与现有的类地行星形成的相关知识统一起来。(完)

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