Astronomers have discovered a distant galaxy.

天文学家们发现了一个遥远的星系。

At some later point, galaxies of stars started to form.

此后的某一时间，各种星系开始形成。

The Galaxy consists of 100 billion stars.

银河系由一千亿颗恒星组成。

The more distant stars in the Galaxy crowd together in a hazy band called the Milky Way.

银河系中较遥远的星体汇聚在一起，形成一条模糊的带子，称为“银河”。