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。
The fourth moon sits between the orbits of Nix and Hydra, which Hubble identified in 2005.
两颗相似大小的行星在模拟低速碰撞中产生了冥王星和卡戎，还有可以形成尼克斯和许德拉的并碎屑。
A simulated low-speed crash between comparably sized planetoids yields a Pluto and a Charon, plus an icy debris disk that could coalesce into a Nix and a Hydra.
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。
It becomes the fourth object known to be circling the distant world after the long-recognised Charon and recently observed Nix and Hydra satellites.
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