Frankly, what's delightful about it is that we now have five major planets orbiting it.

坦白地说，令人愉快的是我们找到了5颗围绕堪科瑞55号主行星。

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"Orbits change," Koehn says. "They change due to interactions with major planets and large asteroids."

科恩说：“轨道的变化，归因于这些小行星与大行星和较大的小行星之间的交互作用。”

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According to new observations, it can be proved quantitatively that a mode of eight major planets of the Solar System is a symmetrical structure: four terrestrial planets and the asteroid belt;

根据最新的观测结果，作者定量论证了太阳系的八大行星模式：它是对称的四个类地行星和小行星带；

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Pluto is the last of the nine familiar planets to be visited by a spacecraft and the program made a major discovery even before leaving the ground.

NPR: NASA Sends Spacecraft to Pluto