Mature galaxies found in young universe

Mature galaxies found in young universe

A group of massive galaxies formed most of their stars in the universe’s first 1.5 billion years

By Christopher Crockett, 15:43 PM March 14, 2014

Galaxies grow up fast — or at least they used to. Astronomers have discovered from the young universe a bevy of massive galaxies that are not only grown-up but retired. The galaxies, each roughly the size of the Milky Way, formed most of their billions of stars in the first 1.5 billion years after the Big Bang, when the universe was just 11 percent of its current age. Astronomers can’t explain how the galaxies formed and shut down so quickly.

The universe was more vibrant in its youth. Distant...

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