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据中国载人航天工程办公室消息，根据计划安排，天宫二号空间实验室已完成全部拓展试验，计划于本月19日择机受控离轨并再入大气层，少量残骸将落入南太平洋预定安全海域。

天宫二号空间实验室是在天宫一号备份目标飞行器基础上改进研制而成，由实验舱和资源舱组成，总长10.4公尺，舱体最大直径3.35公尺，太阳帆板展开后翼展宽度约18.4公尺，起飞重量约8.6吨，具有与神舟载人飞船和天舟货运飞船交会对接、实施推进剂在轨补加、开展空间科学实验和技术试验等重要功能。

天宫二号空间实验室于2016年9月15日发射入轨，设计在轨寿命两年，截至目前，已在轨飞行超过1000天。

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