This flat circular disk is our own Galaxy, the Milky Way, with its spiral structure.
这个圆盘就是我们的星系，银河系，带着旋涡的结构。
Astronomers speculate that M51's spiral structure is primarily due to its gravitational interaction with a neighboring smaller galaxy.
天文学家推断，M51的旋涡状结构可能由它与邻近小型星系的相互引力作用而形成。
By chance, one of the background galaxies, IC 1296 at the upper left, is close enough to show its barred, spiral structure making an attractive visual comparison with M57.
其中一个背景星系IC 1296在左上角，很清楚可以看到棒状及漩涡状的结构，可以跟漂亮的M57互相辉映。
By chance, one of the background galaxies, IC 1296 at the upper left, is close enough to show its barred, spiral structure making an attractive visual comparison with M57.
其中一个背景星系IC 1296在左上角，很清楚可以看到棒状及漩涡状的结构，可以跟漂亮的M57互相辉映。
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