New research helps explain how galaxies first lit up the universe

October 10, 2014 8:46 PM

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Sanchayeeta Borthakur likes the gaps in the clouds to the holes in swiss cheese. Without swiss cheese galaxies, the universe would have remained dark forever.

But astronomers still aren't entirely sure how the process of illumination came about. Nearly 400,000 years after the Big Bang, the protons and electrons that had exploded out in all directions cooled and began forming the first atoms of hydrogen. The result was dense walls of hydrogen, which combin...

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