这里可以看见它的已知3个卫星：冥卫1，冥卫2，和冥卫3。 包括冥王星在内的一群物体，在海王星的凯伯带（数十亿颗在海王星轨道之外绕行的小型冰体构成的碟形带）之上，围绕着太阳的作盘形轨道运行。
Seen here with its three known moons, Charon, Nix, and Hydra, Pluto is a member of a group of objects that orbit in a disklike zone beyond the orbit of Neptune called the Kuiper belt.
我们很盼望能了解像冥王星-冥卫一这样的系统如何形成。
We are eager to know how a system such as Pluto - Charon could form .
1978年的今天，冥王星的冥卫一卫星被发现。
1978 - Charon, a satellite of the planet Pluto, is discovered.
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