Contributed by: Huang Yunle
Omega Centauri is one of largest and most massive globular star clusters orbiting our Milky Way Galaxy. Observing this star cluster has showed that the stars are bunching up near its core. Measurements of the speed of the stars swirling near the cluster’s center revealed that the stars closer to the core are moving faster than the stars farther away, implying that some “unseen matter at the core is tugging on stars near it”. The most likely cause for this would be the presence of a medium sized black hole at the core of this star cluster.