A：Are the galaxies in the universe moving through space?

太空中的各个星系都在其间移动吗?

B：No, the galaxies sit more or less passively in the space around them. But not too much. As the space between galaxies expands, it carries the galaxies further apart - like raisns in an expanding dough.

不是。它们在其所处的空间中或多或少的会有点移动，但基本上是保持不动的。随着各星系间的空间不断扩大，各星系闻的距离也在变大。就像一团在发酵膨胀的葡萄干一样。

A：But I heard that our Milky way galaxy may one day collide with a neighboring galaxy. If galaxies are moving apart from each other, how can they collide?

但我听说我们的银河系也许有一天会和其周围的星系发生碰撞。如果各星系都在朝着彼此相反的方向移动的话，那怎么会撞到一起呢?

B：Well, the universe is a chaotic place, and the gravity from one galaxy, or from a group of galaxies, may disturb the motion of its near neighbors, causing them to collide. However, on average, when you compare two large enough chunks of space, the galaxies in one are moving away from the galaxies in the other.

嗯，宇宙是个混沌之地。某一星系，或一组星系的万有引力可能会影响其周围天体的活动，使得它们发生碰撞。但是，总的来看，当你比较两块足够大的空间时，其中一块中的星系其移动方向是远离另一块中的。

A：Wow, you're really informative. Thanks a lot.

哇，你可真是见多识广了。太感谢了。

B：You're welcome.

不用客气。