Essentially everything you see in that image is a galaxy, a huge collection of gas, dust, and billions of stars!

基本上，你在图片中看到的一切都是一个星系，一个巨大的气体、星尘和数十亿颗恒星的集合!

In our last episode, I talked about galaxies: vast collections of gas, dust, and upwards of hundreds of billions of stars.

在上节课中，我谈到了星系：大量的气体、尘星和数千亿颗恒星的集合。

Let's cut to the chase: the Milky Way galaxy is a vast, flat, disk-shaped collection of gas, dust, and stars — a sprawling megalopolis that's a mind-crushing 100,000 light years across and several thousand light years thick.

银河系是一个巨大的、扁平的、盘状的气体、尘埃和恒星的集合——一个庞大的大都市，直径达10万光年，厚达几千光年，令人叹为观止。