这个理论说我们的太阳系有第十颗行星(如果您将冥王星算作第九颗行星的话，否则这颗神秘的行星就是第九颗。)
This theory says that our solar system has a 10th planet (if you count Pluto as a planet, otherwise the mystery planet is no. 9).
科学家称，这样奇特的排位若是纯属巧合，其几率仅为0.007%，因此他们坚信这一定是因为有第九颗行星存在的缘故。
The scientists say that there's a 0.007 percent probability that the configuration is due to chance, and instead are confident it's a ninth planet.
木卫一：木星四颗最明亮的卫星之一，距木星的距离排为第九。它首先为伽利略所发现。
One of the four brightest satellites of Jupiter and the ninth in distance from the planet. It was first sighted by Galileo.
天文学家们早已预测太阳系存在第九颗行星，并称之为X行星。
Astronomers had long predicted that there would be a ninth planet in the Solar System, which they called planet X.
天文学家们早已预测太阳系存在第九颗行星，并称之为X行星。
Astronomers had long predicted that there would be a ninth planet in the Solar System, which they called planet X.
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