The fourth moon sits between the orbits of Nix and Hydra, which Hubble identified in 2005.
第四颗行星介于尼克斯和许德拉的由哈勃望远镜在2005年确定的轨道之间。
If the probe finds that Nix and Hydra are mostly ice, it'll show Canup's simulation to be a smashing success.
如果探测器发现尼克斯和许德拉上多数都是冰，那么克纳普的模拟实验真是个巨大的成功了。
It becomes the fourth object known to be circling the distant world after the long-recognised Charon and recently observed Nix and Hydra satellites.
继公认良久的冥卫一(卡戎)及最近观察到的尼克斯卫星和许德拉卫星之后，它成为围绕这颗遥远星球运行的第四个实体。
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