宇宙的黑暗时期

Before this, know宇宙微波背景

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The dark ages of the universe — an era of darkness that existed before the first stars and galaxies — mostly remain a mystery because there is so little of it to see, but scientists intensely desire to shed light on them in order to learn secrets about how the universe came into being.

Type a concept, like “slope” or “photosynthesis”.

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