Ep. 683: Cosmic Dawn
Astronomy Cast
00:00
The Lyman Alpha Forest
The universe is never ever going to be truly transparent. We can totally look out and we still see the Lyman Alpha Forest, these clouds of neutral gas between us and distant systems. But there is this magical moment that we're starting to hone in on. It looks like it occurred somewhere between 200 million years and 500 million years after the big bang where the density of the neutral gas between galaxies between clusters of galaxies had become diffuse enough That's when cosmic dawn began.
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