地球是太阳的行星,月球是地球的卫星.
除了地球之外,太阳系还有7颗行星.他们是:
金星,水星,火星,土星,木星,冥王星,海王星.
本来太阳系是9大行星的,但是最近科学家发现太阳系的第九行星"天王星"太小了,就把它降级了.
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