1·有趣的是，照片还显示了甚至延伸到NGC 5195以外的暗弱区域中的红色氢发射结构，在画面顶端。
Intriguingly, this composite also shows red hydrogen emission structures in the faint features extending even beyond NGC 5195, toward the top of the frame.
2·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).