The globular star clusters that surround the Milky Way also seem to come in two age groups.

ECONOMIST: Stellar origins

Previous studies have hinted at the existence of medium black holes, fingering star clusters with suspiciously large masses.

MSN: Existence of middleweight black holes nearly ruled out

Top universities once benefited from having clusters of star professors.

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The researchers suggest the clusters they originated from may no longer be active, thus shedding light on the history of star activity in the galactic core.

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