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The sparks fly

机译：火花飞扬

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Two speed records were set this week. On November 16th, the x-43A, an unmanned American aeroplane, became the fastest air-breathing craft in history-travelling at 11,300kph, or just under ten times the speed of sound. On the same day, the European SMART-I probe (also unmanned) reached the moon, becoming the slowest spacecraft ever to make the trip-it took 13 months. But, surprisingly, this second record is the more significant of the two. The x-43A, designed to test an advanced type of engine called a scramjet, flew under its own power for only ten seconds. The eventual goal is to revolutionise travel within the Earth's atmosphere, and the test may indeed lead one day to such a revolution. But flights from New York to Tokyo in an hour are still a long way off. SMART-I, on the other hand, is part of the vanguard of a way of propelling spacecraft that is already changing and cheapening the business of space travel.
机译：本周创造了两项速度记录。 11月16日，x-43A这种无人驾驶的美国飞机成为历史上最快的呼吸飞行器，航速为11,300kph，是音速的十倍。同一天，欧洲的SMART-I探测器（也无人驾驶）到达月球，成为有史以来最慢的航天器，耗时13个月。但是，令人惊讶的是，第二个记录在两者中更重要。 x-43A设计用于测试一种称为超燃冲压发动机的先进发动机，它在自身功率下只能飞行十秒钟。最终的目标是彻底改变地球大气层中的旅行，而这次试验确实有可能导致这一革命。但是从纽约到东京的飞行在一小时内仍然很遥远。另一方面，SMART-I是推动航天器前进方式的一部分，该方法已经在改变并降低了太空旅行业务的成本。

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