由此看来，即使国际天文学联合会保住冥王星的行星地位，经典的太阳系九大行星理论也仍然要改，只是改法相反而已。
It seems that even if the IAU had kept Pluto's status as a planet, the classical theory of nine planets in the solar system would have had to be changed, but the other way around.
关于太阳系里的九大行星，你知道哪些奥秘？
What mysteries do you know about the nine planets in the solar system?
关于太阳系的九大行星你能回答这些测试题吗？
Can you answer these quiz CARDS about the planets in our solar system?
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