Thursday, December 13, 2012

Hubble identifies oldest galaxies yet | TG Daily

 

Astronomers have long debated whether hot stars in such early galaxies could have provided enough radiation to warm the cold hydrogen that formed soon after the big bang. This process, called reionization, made the universe transparent to light, and is thought to have occurred 200 million to a billion years after the big bang.

Hubble identifies oldest galaxies yet | TG Daily

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