Portal origin URL: Hubble Investigates an Enigmatic Star ClusterPortal origin nid: 480599Published: Friday, June 10, 2022 - 08:00Featured (stick to top of list): noPortal text teaser: Unlike most globular clusters, Ruprecht 106 may be what astronomers call a single population globular cluster.Portal image: bright, rounded cluster of white stars, some with blue or red halos.