nine planets meaning in Chinese

九大行星

Scale of the nine planets of the solar system
太阳系九大行星的大小比较
Earth is one of nine planets which revolve around the sun
地球是围绕太阳旋转的九个行星之一。
What mysteries do you know about the nine planets in the solar system
关于太阳系里的九大行星，你知道哪些奥秘？
As we already know , our solar system contains nine planets and many comets and other objects
我们知道太阳系是由9大行星和许许多多的小行星、彗星组成的一个天体系统。
If the nine planets really align , the inner and outer planets will locate at both sides of the earth , and will not appear at the same region of sky
为什么木星比其他大那么多倍？最多卫星的行星是那个好像是土星？可否给我一些高解象的九大行星相片？

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