Uploaded October 2012 | Updated September 2026, 2 weeks ago

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New research into the globular cluster M22 centres on black holes at the core. Messier object playlist: bit.ly/MessierObjects

Nature paper: nature.com/nature/journal/v490/n7418/full/nature11490.html

This video features Professor Mike Merrifield from the university of Nottingham.

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Videos by Brady Haran

Editing in this film by Stephen Slater