Blue Stagglers in Globular Clusters . ... On the left is ancient globular cluster 47 Tucanae which formed many billions of years ago. ... Circled are mysterious stars called " blue stragglers. Stars as bright and blue as blue stragglers live short lives , much shorter than the age of the host globular cluster itself. But this contradicts evidence that globular cluster stars formed all at once. ... NASA Web Site Statements, Warnings, and Disclaimers . NASA Official: Jay Norris. ...