20世纪990年代以来,越来越多的观测发现,月球上可能有水和氢氧基。这些发现进一步激发了人类对探测月球的兴趣。从2006年开始,欧洲航天局、印度、中国及美国的月球飞行器接连撞月,将撞月活动推向了高潮。2009年10月9日美国又一艘撞月飞行器升空,此次计划的主要目的是在月表之下 Since the 990s of the 20th century, more and more observations have found that there may be water and hydroxyl groups on the moon. These findings further stimulate human interest in exploring the moon. From 2006 onwards, the lunar rocket of the European Space Agency, India, China and the United States went into collision with each other in succession and pushed the collision to the climax. On October 9, 2009, another U.S. aircraft hit the airborne spacecraft. The main purpose of this plan is to stay below the moon’s surface