This line of reasoning underlies an exciting new theory of spiral - galaxy structure.
这一推理思路构成了一种激动人心的有关螺旋形星系结构的新理论的基础.
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The mystery arises when one considers how a spiral galaxy rotates.
当人们考虑旋涡星系是如何转动的时候难题就来了.
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Explanation: This bright, beautiful spiral galaxy is Messier 64, sometimes known as the Black Eye Galaxy.
说明: 这个既明亮又美丽的螺旋星系名为梅西叶64(M64), 有时候也被称为是黑眼圈星系.
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Explanation: This impressive color composite shows spiral galaxy M 81 across the electromagnetic spectrum.
说明: 这张令人影像深刻的彩色合成影像显示了通过了电磁波频普拍摄到的旋涡星系M81.
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Explanation: Big, beautiful spiral galaxy NGC 7331 is often an analog to our own Milky Way.
说明: 巨大美丽的螺旋星系NGC7331经常被认为与我们自己的银河类似.
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