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超新星打击或曾让地球臭氧层缺失 - 站长搜索
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超新星打击或曾让地球臭氧层缺失

趣科技 2020-08-24 10:42:06 转载来源: 科技日报

近日,一个由美国伊利诺伊大学厄巴纳-香槟分校的天文学教授菲尔兹领导的研究小组,研究了3.59亿年前泥盆纪和石炭纪间的一次物种灭绝事件,发现其可能与一次天文事件有关。 在这一时期的岩石中,植物孢子似乎被强烈的紫外线晒伤——这是长期臭氧缺失的证据

近日,一个由美国伊利诺伊大学厄巴纳-香槟分校的天文学教授菲尔兹领导的研究小组,研究了3.59亿年前泥盆纪和石炭纪间的一次物种灭绝事件,发现其可能与一次天文事件有关。

在这一时期的岩石中,植物孢子似乎被强烈的紫外线晒伤——这是长期臭氧缺失的证据。“距离地球约65光年的一次或多次超新星爆发,可能是造成臭氧长期缺失的原因。”菲尔兹表示。

该小组研究了其他如陨石撞击、太阳爆发和伽马射线暴等天文事件,发现这些都不能造成长时间的臭氧层缺失。而且,超新星会对地球造成“二次打击”:超新星爆发会让地球暴露于紫外线、X射线和伽马射线中;超新星爆发产生的碎片会冲击太阳系,使太阳系内的行星长期受到因超新星碎片而加速的宇宙射线辐射,对地球臭氧层的破坏可持续10万年之久。

研究人员表示,若想证明这一观点,需要在化石中找到“关键证据”——放射性同位素钚-244和钐-146,“这两种同位素在地球上都不是自然存在的,它们到达地球的唯一途径就是通过宇宙爆炸”。

相关研究成果发表于《美国国家科学院院刊》。

标签: 超新星 打击 地球 臭氧层 缺失


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