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 ...

“星系”的拼音为：xīng xì...

“星系”的英语可以翻译为：[天] galaxy，galact-，universe ...