问题在于,这里面的很多主意都依赖于充足的预警时间,即使是处理如2012 DA14般的小块头小行星。
That means shifting them at short notice is going to be difficult.
这就意味着,在很短的预知时间下,将很难改变他们的轨道。
When American s National Research Council studied the problem in 2010, it came to theconclusion that even nuclear weapons would require warnings times measured in years ordecades.
当美国国家研究委员会在2010年研究这个问题时,得出一个结论:即使是使用核武器也需要数年甚至数十年的预警时间。
Evacuation, it said, was the only feasible option for dealing with little warning. Others aremore optimistic.
委员会同时提到,在面对那些很难被辨认出而不期而至的小行星时,疏散是唯一可行的办法。
The day before the explosion over Russia researchers at the University of California, SantaBarbara, proposed putting into orbit a solar-powered laser that could use its beam tovaporize the surface of an incoming asteroid and thus knock it off course, even at a few days notice.
其他人要乐观一些。就在俄国上空的爆炸发生前一天,来自圣巴巴拉加利福尼亚大学的研究人员提出一个把太阳能激光器发射到小行星轨道的方案,使用激光蒸发掉小行星表面的物质。这样即使只有数天的预警时间,也能使其偏离轨道。
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