For tens of millions of years, our newborn Universe was shrouded in hydrogen. Bit by bit, this vast mist was torn apart by the light of the very first stars in a dawn that defined the shape of the emerging cosmos.
For tens of millions of years, our newborn Universe was shrouded in hydrogen. Bit by bit, this vast mist was torn apart by theHaving a timeline for this colossal shift would go a long way in helping us understand the Universe's evolution, yet so far our best attempts have been fuzzy estimates based on low-quality data.
Soon the entire Universe was filled with uncharged atoms, a sea of them bobbing back and forth in the infinite darkness. Studies conducted more than 50 years ago made use of the way light from violently active galactic cores was absorbed by interceding gas floating about in the nearby intergalactic medium. Find a series of quasars stretching into the distance, you can effectively see a timeline of neutral hydrogen gas being ionized.
According to their own figures, the last dregs of original hydrogen fell to the rays of first-generation starlight around 1.1 billion years after the Big Bang.
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