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日本宇宙航空开发机构（JAXA）周五（22日）表示，其探测器“隼鸟2号”成功降落在距离地球3.4亿公里的小行星“龙宫”。隼鸟2号会采集岩石样本，或有助人类了解太阳系的起源。

隼鸟2号于2014年12月升空，经历逾4年时间终于成功降落。从周四下午开始，隼鸟2号从龙宫上空20公里的位置出发，以每秒约90厘米的速度下降，当降至距离地表不到5公里后再放慢速度，小心接近地面。

由于龙宫的表面地形险峻，散布着很多岩石，为避免撞上岩石导致机体损伤，隼鸟2号按照规定步骤，先找到事先落下的标记球，在空中8.5米处一度停下等待，待准备完毕后才开始降落。按照计划，隼鸟2号会向龙宫表面发射一枚“子弹”，并收集所激起的物质，稍后带回地球研究。#