| 1. | The formation of the satellite systems of the giant planets parallels in many respects the formation of the planets .
大行星的卫星系统的形成在许多方面相似于行星的形成。 |
| 2. | That ' s easy . everyone knows that there are nine
很简单。大家都知道有九大行星。 |
| 3. | Scale of the nine planets of the solar system
太阳系九大行星的大小比较 |
| 4. | The energy of the planets influences our everyday lives
这10大行星，是占星学中判断的主干。 |
| 5. | So the new model of our solar system has eight classical planets
所以新模型我们太阳系有八大行星。 |
| 6. | Among all the planets , even lower than the density of water
密度却是众多大行星中最低的，甚至比水更低。 |
| 7. | Do you know the nine major planets
你知道九大行星吗？ |
| 8. | 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？ |
| 9. | Big planets close to a star have big effects and orbit quickly
接近于恒星的大行星就有着大的效应，并且围绕恒星运行的速度也就快。 |
| 10. | This summer , the iau will debate whether pluto should remain a planet
今年夏天，国际天文学联合会将决定是否仍旧把冥王星视为大行星。 |
