螺旋状星系 spiral galaxy 一种星系，具有由云气、尘埃、炽热亮星及旋臂所构成的盘面。
矮星系也许比螺旋状星系含有更多的暗物质。
The dwarf galaxies may have even a higher amount of dark matter than spiral galaxies.
这是宇宙中的一个非常著名的螺旋状星系。
虽然NGC 3808 A只显出了侧面，但可以看出它们两个都是螺旋状星系。
Though NGC 3808a only made its sideline seen, it was not difficult to discover that both were spiral galaxies.
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