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

太空中的各個星系都在其間移動嗎?

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。它們在其所處的空間中或多或少的會有點(diǎn)移動，但基本上是保持不動的。隨著各星系間的空間不斷擴(kuò)大，各星系聞的距離也在變大。就像一團(tuán)在發(fā)酵膨脹的葡萄干一樣。

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?

但我聽說我們的銀河系也許有一天會和其周圍的星系發(fā)生碰撞。如果各星系都在朝著彼此相反的方向移動的話，那怎么會撞到一起呢?

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，宇宙是個混沌之地。某一星系，或一組星系的萬有引力可能會影響其周圍天體的活動，使得它們發(fā)生碰撞。但是，總的來看，當(dāng)你比較兩塊足夠大的空間時，其中一塊中的星系其移動方向是遠(yuǎn)離另一塊中的。

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

哇，你可真是見多識廣了。太感謝了。

B：You're welcome.

不用客氣。