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首页> 外文期刊>The Journal of the Royal Astronomical Society of Canada >Second Light: The Nearest, most Recent Supernovae to Earth
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Second Light: The Nearest, most Recent Supernovae to Earth

机译:第二光:地球上最近,最近的超新星

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Averaged over time, supernovae should explode within about 100 pc of Earth every 2-4 million years. I hasten to point out that 100 parsecs is far enough away not to have any damaging effect on Earth. It might be surprising to some readers, but radioactive isotopes created in a supernova could be carried to Earth on interstellar dust grains (such grains rain down on us every day). In fact, the isotope ~(60)Fe (iron) was discovered in one sample of ocean crust back in 1999 and attributed to a supernova. Now two studies, one by Anton Wallner of the Australian National University and his colleagues, and one by Dieter Breitschwerdt of the Berlin Institute of Technology and his collaborators, have considerably expanded what we know about that supernova (see the 2016 April 7 issue of Nature).
机译:按时间平均,超新星应该每2-4百万年在地球约100 pc内爆炸。我必须指出,100秒差距足够远,不会对地球产生任何破坏性影响。对于某些读者来说,这可能令人惊讶,但是由超新星产生的放射性同位素可能会通过星际尘埃颗粒(这种颗粒每天都落在我们身上)被带到地球。实际上,同位素〜(60)Fe(铁)是在1999年的一个海洋壳样本中发现的,并归因于超新星。现在,两项研究(一项由澳大利亚国立大学的安东·沃尔纳及其同事进行,另一项由柏林技术学院的Dieter Breitschwerdt及其合作者进行)大大扩展了我们对超新星的了解(参见2016年4月7日的《自然》杂志)。

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