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                                                                                                                                                                          澳门汇丰娱乐网站:NASA发小行星与地月合照 下世纪末可能撞击地球

                                                                                                                                                                          2019-01-16 00:30 酷艾色新闻资讯中心

                                                                                                                                                                          (原标题:NASA发小行星与地月合照 下世纪末可能撞击地球)

                                                                                                                                                                          NASA发小行星与地月合照 下世纪末有2700分之一概率撞击地球 (来源:~)

                                                                                                                                                                          美国航空航天局(NASA)近日公布了一张小行星“贝努(Bennu)”与地球和月球的合照。

                                                                                                                                                                          贝努是一个有威胁性且非常神秘的近地天体。22世纪末(2175到2199年间),它将近距离接近地球,碰撞地球的概率为2700分之一。这颗小行星赤道的直径约为500米,重达8700万吨。若是撞上地球,威力将会是广岛原子弹的8万倍。

                                                                                                                                                                          美国在2016年发射探测器“奥西里斯-REx”(OSIRIS-REx)。近日它抵达贝努上空,开始“伴飞”,并拍下贝努与地月的合照。