更新时间：2007年12月22日12:21 关键字：265key
摘友：sun
Observatories watched the event from Earth and scientists hoped the cloud of dust and debris would provide clues to the geological composition of the site.
"That's it -- we are in the Lake of Excellence," said spacecraft operations chief Octavio Camino as applause broke out in mission control in Darmstadt, Germany. "We have landed."
Minutes later, officials showed off a picture captured by an observatory in Hawaii displaying a bright flash from the impact.
Launched into Earth's orbit by an Ariane-5 booster rocket from Kourou, French Guiana, in September 2003, SMART-1 used its ion engine to slowly raise its orbit over 14 months until the moon's gravity grabbed it.
The engine, which uses electricity from the craft's solar panels to produce a stream of charged particles called ions, generates only small amounts of thrust but only needed 80 kilograms of xenon fuel.
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来源：http://edu.qq.com/a/20060904/000361.htm
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