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Near-Earth Asteroids:Fewer than Expected

机译:近地小行星:比预期少

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摘要

HUMANITY HAS MORE immediate threats to consider, but if you worry about a giant asteroid hitting Earth, the already slim chance of that happening in a given millennium just dropped by nearly half - thanks to the much-awaited asteroid survey carried out by NASA's Wide-field Infrared Survey Explorer (WISE) space telescope (S&T£o December 2009, page 26). The WISE team finds that there are less than 60% as many near-Earth asteroids, or NEAs, as earlier estimated.
机译:人类还有更多直接的威胁需要考虑,但是如果您担心一个巨大的小行星撞击地球,那么在给定的千年中发生这种情况的机会已经很小,几乎下降了一半,这要归功于NASA广受欢迎的小行星调查野外红外测量浏览器(WISE)空间望远镜(S&T £ o,2009年12月,第26页)。 WISE团队发现,近地小行星或NEA的数量少于早先估计的60%。

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