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.
2
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?
3
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?