stellar classification

例句：

1. 1. The star's classification is based on its distance from the Sun.
   这颗星的分类是基于它离太阳的距离。
2. 2. The astronomers classified the stars according to their colors and sizes.
   天文学家根据它们的颜色和大小将星星分类。
3. 3. The classification of stars has changed over time due to advances in telescope technology.
   由于望远镜技术的进步，恒星的分类已经发生了变化。