Hubble spies ancient 'Chandelier Cluster' forming stars in two bursts

Hubble spies ancient 'Chandelier Cluster' forming stars in two bursts. The sparkling NGC 6723, 27,000 light-years away, showed star formation in two bursts. Astronomers used Hubble to study this cluster, finding complex star histories. Many stars in globular clusters are over 10 billion years old.