The Unusual Cluster: Terzan 5
Around 40 years ago, the cluster of stars in this space photograph (called Terzan 5) was discovered. Since then, it's been discover that it is a cluster like no other! Unlike other clusters, Terzan 5 contains two distinct groups of stars that are unmistakably different – with an age-gap of roughly 7 billion years!
Credit:
NASA/ESA/Hubble/F. Ferraro
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