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日本宇宙航空开发机构(JAXA)周二宣布，无人探测器“隼鸟2”号将在周三离开太阳系小行星“龙宫”，并返回地球，预料将于2020年底将采集到的小行星岩石样本带回地球。

隼鸟2号于2014年12月发射升空，经过约3年半的太空之旅，于去年6月抵达小行星龙宫附近，并2次着陆采集岩石样本。

探测器更于今年4月成功以金属弹，在小行星表面撞出首个人造陨石坑。

文部科学相萩生田光一表示，期待隼鸟2号安全返回，并从样本中获得新知识。

隼鸟2号返回地球时，与早前在大气层燃烧殆尽的隼鸟1号不同，将投下装有样本的密封舱后，继续在太空展开探测。

岩石样本将有助研究46亿年前诞生的太阳系起源，并期待从样本中发现可构成生物的有机物。