实际上，我们已经知道我们附近的仙女座大型螺旋星系大约距离有200万光年之遥，并且正在靠近银河系。
In fact, the nearby large spiral Andromeda Galaxy is known to be some 2 million light-years away and approaching the Milky way.
最后一张照片是名为ngc 4145的典型螺旋星系，距地球约6800万光年。
The last picture is of a classic spiral galaxy called NGC 4145, located approximately 68 million light-years from Earth.
已经灭绝了6500万年之久的菊石是一种带有多室螺旋状外壳的海洋头足类动物，其小室之间的阻隔即缝合线就是一种复杂的分形曲线。
Extinct for 65 million years, ammonites were Marine cephalopods that built chambered spiral shells. The walls between these Chambers, called sutures, were complex fractal curves.
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