galactic variable

例句：

1. 1.The galactic variable star is a fascinatingobject that can change its brightness overtime.
   这个银河系变星是一个令人着迷的对象，它可以随时间改变亮度。
2. 2. Galactic variables are important for understandingthe evolution of stars and planets inour galaxy.
   银河系变星对于理解我们星系中恒星和行星的演化非常重要。
3. 3. The discovery of a new galacticvariable star has sparked excitement among astronomers.
   发现一个新的银河系变星引起了天文学家们的兴奋。