old nebula

例句：

1. 1. The old nebula is a fascinating object in the night sky.
   这个老星云是夜空中一个令人着迷的天体。
2. 2. The ancient nebula was believed to be a celestial body.
   那个古老的星云被认为是一个天体。
3. 3. The old nebula has been studied for its properties and composition.
   这个老星云因其性质和组成而受到研究。