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地球曾遭100公里大小彗星撞击 万幸人类生存了下来

2018-2-4 20:57| 投稿: xiaotiger |来自: 互联网

摘要: 据《每日邮报》北京时间2月4日报道,近一万三千年前,地球可能曾突然遭遇世界末日般的场景:接二连三的流星照亮了天空,接下来是强大的冲击波和火焰——占地球10%陆地面积的土地都在燃烧着熊熊大火。 随着灰尘遮挡 ...

据《每日邮报》北京时间2月4日报道,近一万三千年前,地球可能曾突然遭遇世界末日般的场景:接二连三的流星照亮了天空,接下来是强大的冲击波和火焰——占地球10%陆地面积的土地都在燃烧着熊熊大火。

随着灰尘遮挡了阳光,天空变得黑暗下来,气温迅速下降,导致植物死亡,冰川前进,地球很快进入接近冰河时代的状态。

人类经历了带来严重后果的这一灾难。

这是一项新研究的结果。研究称,一万二千八百年前,一个62英里(100公里)宽彗星解体的碎片与地球相撞,并引发比造成恐龙灭绝的陨石撞击地球(一种假说)更极端的事件。

由20多名研究人员对地球化学和同位素标记进行的这项最新研究认为,发生在数千年前的一次宇宙撞击事件在整个北半球留下了高浓度的铂。

许多地点都存在高浓度的铂,其中包括从格陵兰冰原采集的冰核,它们与新仙女木时期的分界线——约一万二千八百年前上一个冰河时代结束之际的一个时期,当时冰川临时再次开始前进——有关联。

根据这项新研究,一次撞击事件可能引发了这次地球再次变冷的“插曲”。

堪萨斯大学物理学和天文学名誉教授艾德里安·梅洛特(Adrian Melott)表示:“这项研究包括在全球170多个不同地点进行的勘测。提出的假说是,一颗大型彗星解体成碎片,并与地球相撞,引发了这场灾难。”

许多不同的化学特征——二氧化碳、硝酸盐、氨等等——似乎都表明,大约10%的地表面积,或者说大约一千万平方公里的土地面积,都被笼罩在大火中。

花粉分析表明,松林可能被燃烧殆尽,后来被杨树取而代之。

这次彗星撞击地球事件,给当时的人类和动物带来了同样的灾难。

晚更新世时期一些体形较大的物种因此绝迹,受之后的许多健康问题影响,人类经历了文化转变和衰落。

梅洛特说:“计算结果表明,这次撞击会消耗臭氧层,导致皮肤癌和其他负面健康影响的增加。撞击假说仍然只是一个假设,但是这项研究提供了大量证据,我们认为这些证据只能由一次重大的宇宙天体撞击事件得到解释。”

据研究人员称,这个解体彗星的残留物,可能仍然停留在目前的太阳系中。


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本文出自:http://www.cnbeta.com/articles/science/695909.htm

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