planetary temperature

例句：

1. 1. The planetary nebula is a fascinating object in the night sky.
   行星状星云是夜空中一个迷人的天体。
2. 2. The solar system consists of the sun and all the planets.
   太阳系由太阳和所有行星组成。
3. 3.The solar system is the closest we can get to understanding the origins of life.
   太阳系是我们能够接近理解生命起源的最接近的地方。