quasar

This quasar was the only one without a known host galaxy.

这个类星体似乎无依无傍，不在任何一个星系当中。

Within a few million years, both quasar and galaxy will have merged.

在几百万年的时间里，类星体和伴星系将会合并在一起。

But scientists have now found a quasar that's apparently churning out new stars in the absence of a host galaxy.

但是现在科学家们发现，一颗没有挂靠主星系的类星体显然在大量地制造出新恒星。