上千球状星团围绕着银河，其中包含一些宇宙中最老的星星。
Surrounding the Milky Way are thousands of spherical globular star clusters containing some of the oldest stars in the Universe.
外部的圈层则由星星组成,它们围绕着我们旋转,这就是为什么我们看到的星星会在天空中移动。
The outer most crystalline sphere consists of fixed stars and these rotate around us which is why we see the stars moving in the sky.
因此当一个类星体趋于休眠，留下来的就是我们通常和一个正常的星系联系起来的东西——星星和气体，他们围绕着一个隐藏着物质的大洞形成一个漩涡。
So when a quasar goes dormant, what's left are the things we associate with a normal galaxy — stars and gas swirling around a central and hidden pit of matter.
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