《魂斗罗》将拍摄国产电影?景甜或将饰演女主角?!
Publication: Astrobiology
Volume 19, Issue Number 6
Abstract
Considerable data and analysis support the detection of one or more supernovae (SNe) at a distance of about 50?pc, ~2.6 million years ago. This is possibly related to the extinction event around that time and is a member of a series of explosions that formed the Local Bubble in the interstellar medium. We build on previous work, and propagate the muon flux from SN-initiated cosmic rays from the surface to the depths of the ocean. We find that the radiation dose from the muons will exceed the total present surface dose from all sources at depths up to 1?km and will persist for at least the lifetime of marine megafauna. It is reasonable to hypothesize that this increase in radiation load may have contributed to a newly documented marine megafaunal extinction at that time.
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百度 细剖缘由,不难发现历来中国所举办的摄影节多都只是热闹非凡,欢愉结束之后,那至关重要的,最后的四分之一却始终没有画圆。View all available purchase options and get full access to this article.
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Associate Editor: Norman Sleep
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Published online: 11 June 2019
Published in print: June 2019
Published ahead of print: 27 November 2018
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