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Dealing with asteroid strikes 应对小行星撞击 A close shave 近地掠过 After a hit and a near miss minds are focusing onthe risks from space rocks 在一次撞击和一次近距离擦肩而过后，人们开始关注来自外太空岩石的威胁 One close shave with an asteroid is cause for excitement. 一次小行星近地掠过是一种刺激， Two on the same day is scary. 同一天发生两次就是惊险了。 On February 15th planet Earth experienced exactly that, as a hunk of itinerant space rockpassed by extremely close. 在2月15日，行星地球正经历了这样的惊险：一块流动的大块头太空岩石在咫尺的距离掠过地球， While another exploded spectacularly in the skies above Russia. 而另一块则十分壮观得在俄国上空爆炸。 The first asteroid, called 2012 DA14,had been known to astronomers for around a year. 第一颗小行星名为2012 DA14，天文学家在大约一年前发现。 They had calculated that there was no risk of collision. But the 30-metre, 190,000-tonnerock came close: 27,700Km above the surface, inside the orbit of some satellites. | 
