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A história que esse número promete datar é a última grande transição de fase do hidrogênio cósmico. Cerca de 380 mil anos depois do Big Bang, o Universo esfriou o suficiente para que prótons e elétrons se combinassem em átomos neutros, liberando a radiação que hoje medimos como fundo cósmico de micro-ondas. A partir dali, o cosmos atravessou um longo período sem fontes de luz, a chamada idade das trevas. Quando as primeiras estrelas e galáxias acenderam sua radiação ultravioleta.
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