实际上，这种现象在宇宙中很普遍，图中南天星座波江座(河流星座)河岸中这醒目的一对相互作用星系就是例子。

In fact, the practice is common in the universe and illustrated by this striking pair of interacting galaxies from the Banks of the southern constellation Eridanus (the River).

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也被编号成ngc 5194, M 51是一对著名的相互作用星系的一部分，其旋臂和尘带明显从伴星系ngc 5195(上方)的前面扫过。

Also cataloged as NGC 5194, M51 is a part of a well-known interacting galaxy pair, its spiral arms and dust lanes clearly sweeping in front of companion galaxy NGC 5195 (top).

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在画面最右侧的部分略微有所压缩，好让你能看到背景上引人注目的相互作用的一对星系。

The frame at the far right has been compressed slightly to bring into view an intriguing interacting pair of background galaxies.

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