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（华盛顿1日综合电）美国航太总署（NASA）周一宣布，太空探测船“欧西里斯号”（OSIRIS-REx）已进入古老小行星“贝努”（Bennu）的轨道，创下两项纪录。

美联社报道，贝努距地球1.1亿公里，欧西里斯号进入它的轨道，创下人类的太空飞行器进入轨道的天体中最遥远的纪录。贝努的直径约480公尺，欧西里斯号仅在距离它约1.6公里处的轨道上运行，创下另一项纪录。

欧西里斯号于2016年9月由“擎天神5号”（Atlas V）运载火箭从佛罗里达州卡纳维尔角空军基地送上太空，于2018年12月初飞抵贝努，进入轨道后将伴随贝努飞行两年，用光谱仪、雷射和相机，分析小行星上是否有水和稀有矿物，探测船回航前会伸出机械手臂，紧贴贝努表面喷出压缩空气，同时由真空回收器吸入扬起的尘土，目标收集60克至2公斤的样本，于2023年返回地球。

贝努接近地球环绕太阳的轨道，且据信保留了45亿年前的物质。科学家除了想知道太阳热力如何影响会威胁地球的小行星外，也或有助印证科学界一个重要理论──水和有机化合物是由小行星撞击地球时带来的。

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