How the universe's brightest galaxies were born

The brightest galaxies in our universe are fuelled by what their gravity sucks in, not through explosive mergers of star systems as scientists previously argued, researchers said Wednesday. In what may be the most complete explanation yet of how these enormous collections of stars and dust came to be, scientists found the galaxies pulled in hydrogen gas and then used it to pump out the equivalent of up to 2,000 Suns per year, according to a study in Nature. "The massive galaxy grows via [pulling