This cluster has an angularcore radius of18″ and a physical radius of approximately 47 ly.[3] It has a combined 4,200[3] times themass of the Sun and is around 250 million years old.[4] Themetallicity of the cluster – what astronomers term the abundance of elements with higheratomic number than helium – is at around −0.62, or only 24% of that in the Sun. The turn-off mass for the cluster, when a star of that mass begins toevolve off themain sequence into agiant, is about 4.0 to4.5 M☉.[7]
Media related toNGC 265 at Wikimedia Commons
