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Most galaxy clusters - the largest structures in the Universe - are "red and dead", having long since produced all the stars they can make.
But cluster formation should, according to theory, include a cooling phase, resulting in blue light from new stars. Writing in Nature, researchers say they have seen evidence that the enormous Phoenix cluster makes 740 stars a year.
"It is indeed reassuring to see this process in action," he said. "Further study of this system may shed some light on why other clusters aren't forming stars at these high rates, as they should be." The team is hoping to get time on the Hubble Space Telescope, which should provide spectacular images of the central blue star-forming region.
Originally posted by gortex
...[The cluster] is about seven billion light-years away ...