由于氢原子阻拦光线，年轻的宇宙进入了“黑暗时期”。
Because hydrogen atoms trap light, the young universe entered its "dark ages."
但是在宇宙学中间，接下来的500万年被叫做黑暗时期。
But the ensuing 500 million years are the so-called dark ages of cosmology.
接着，是一个长长的沉闷的黑暗延伸时期，在这个过程中，一些小小的涟漪开始划过宇宙这平滑的幕布。
A long stretch of boring darkness ensued, during which some ripples began to ruffle the otherwise smooth fabric of space.
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