According to the discoveries of the astronomers, when did galaxies form? [br] Wh

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问题 According to the discoveries of the astronomers, when did galaxies form? [br] What happened when the ionized hydrogen became more transparent?

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答案 The galaxies’ light can pass through.

解析根据题干中的关键词ionized hydrogen和more transparent定位到倒数第三段最后一句，可知电离氢变得吏为透明，这使得星系的光线可以从中穿过。

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Accordingtothediscoveriesoftheastronomers,whendidgalaxiesform?[br]Wh