Beyond One Burst: Globular Cluster NGC 6723 Rewrites Stellar Birth

NGC 6723, a globular cluster located approximately 27,000 light-years away in the constellation Sagittarius, is revealing secrets about stellar evolution that challenge long-held theories. New analysis of data from the Hubble Space Telescope indicates that the stars within this ancient structure did not form all at once, but rather in multiple distinct episodes. Multiple Stellar Generations Discovered Observations of NGC 6723 in visible and near-infrared light revealed a striking color gradient: younger, bluer stars are concentrated in the cluster's core, while older, orange stars populate its outer regions. This visual distinction is a key indicator that stellar formation was not a singular event. The research identified two primary epochs of star birth. The first burst of star formation was followed by a second, significant surge approximately 634 million years later. This staggered formation process contradicts the previously dominant theory that all stars within globular clusters coalesce simultaneously from a single, massive gas cloud.