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2012年12月13日,美国国家航空航天局(NASA)宣布“圣杯”(GRAIL)月球探测任务已完成,美国东部时间17日17点28分,GRAIL探测器在地面指令控制下撞向了月球靠近北极附近的一座2500m高的山峰。此次撞击目的是避免探测器在燃料耗尽后自行坠毁可能会破坏月面上的一些重要历史遗迹,如当年阿波罗探月的着陆点等等。NASA的GRAIL任务目标是精确探测并绘制月球的重力场图以判断月球内部构造。GRAIL采用两
On December 13, 2012, NASA announced that the “GRAIL” lunar exploration mission has been completed. At 17:28 on the 17th U.S. Eastern Time, the GRAIL probe crashed into the ground under the command of the ground command The moon is near a 2500m high mountain near the North Pole. The aim of this collision is to prevent the detector from crashing on its own after the fuel is depleted, which could destroy some important historical sites on the lunar surface, such as the landing point of the Apollo lunar exploration that year. The goal of NASA’s GRAIL mission is to accurately detect and map the moon’s gravitational field maps to determine the lunar internal structure. GRAIL uses two