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8 天
NASA韦伯望远镜首次提供了关于海王星外天体的高分辨率光谱数据
跨海王星天体(TNO)是冰冻天体,它们的大小差异很大,有像冥王星和阋神星这样的大型矮行星--直径都在1500英里左右,也有小得多的天体,比如阿罗科斯,直径只有几十英里。 这些遥远的天体绕太阳运行的距离与海王星的轨道相当,甚至远远超过。
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