An age difference of two billion years between a metal-rich and a metal-poor globular cluster
2013
An absolute age of about ten
billion yearsis determined for the
globular cluster47 Tucanae, which is about two
billion yearsyounger than the cluster NGC 6397 is thought to be, suggesting that metal-rich clusters like 47 Tucanae formed later than metal-poor clusters like NGC 6397.
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