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).
据报道已经在太阳系发现了第十颗行星。
It's reported that a tenth planet has been found in the solar system.
据报道已经在太阳系发现了第十颗行星。
It's reported that a tenth planet has been found in the solar system.
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