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SSS 2010-04-27

时间:2010-06-11 02:38来源:互联网 提供网友:swalloer   字体: [ ]
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In 1970, the Soviet1 Union put a laser reflector on the moon, carried by a rover. A few months later, it disappeared. Some speculated that the rover had fallen into a crater2 or parked in such a way as to render the reflector inaccessible3. Now after 40 years on the lunar surface, the reflector has been found.

A team at U.C. San Diego has been searching for it. Earlier this year, NASA’(National Aeronautics4 and Space Administration)lunar reconnaissance orbiter camera provided images of the regional landing area. A sunlit speck5 miles from where the team was looking, turned out to be the rover and reflector. The San Diego team was quickly able to pinpoint6 the reflector's location to within 10 meters. Scientists send laser pulses to the moon and measured signals that bounce back from three reflectors left by Apollo astronauts, along with another Soviet one. This information helps track the moon's position and orbit. And the researchers say that the rediscovered Russian reflector is particularly useful for studying in the moon liquid core and testing ideas about gravity. Says team leader Tom Murphy of the reflector, “It’s got a lot to say after almost 40 years of silence."

 


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1 Soviet Sw9wR     
adj.苏联的,苏维埃的;n.苏维埃
参考例句:
  • Zhukov was a marshal of the former Soviet Union.朱可夫是前苏联的一位元帅。
  • Germany began to attack the Soviet Union in 1941.德国在1941年开始进攻苏联。
2 crater WofzH     
n.火山口,弹坑
参考例句:
  • With a telescope you can see the huge crater of Ve-suvius.用望远镜你能看到巨大的维苏威火山口。
  • They came to the lip of a dead crater.他们来到了一个死火山口。
3 inaccessible 49Nx8     
adj.达不到的,难接近的
参考例句:
  • This novel seems to me among the most inaccessible.这本书对我来说是最难懂的小说之一。
  • The top of Mount Everest is the most inaccessible place in the world.珠穆朗玛峰是世界上最难到达的地方。
4 aeronautics BKVyg     
n.航空术,航空学
参考例句:
  • National Aeronautics and Space undertakings have made great progress.国家的航空航天事业有了很大的发展。
  • He devoted every spare moment to aeronautics.他把他所有多余的时间用在航空学上。
5 speck sFqzM     
n.微粒,小污点,小斑点
参考例句:
  • I have not a speck of interest in it.我对它没有任何兴趣。
  • The sky is clear and bright without a speck of cloud.天空晴朗,一星星云彩也没有。
6 pinpoint xNExL     
vt.准确地确定;用针标出…的精确位置
参考例句:
  • It is difficult to pinpoint when water problems of the modern age began.很难准确地指出,现代用水的问题是什么时候出现的。
  • I could pinpoint his precise location on a map.我能在地图上指明他的准确位置。
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TAG标签:   SSS  reflector
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