“星系”造句

他们把望远镜转向附近其他星系。
They turned their telescopes towards other nearby galaxies.

类星体是遥远星系的极为活跃的核心体.
Quasars are the highly energetic cores of distant galaxies.

我们还不知道宇宙中有多少个星系.
We still don't know how many galaxies there are in the universe.