Diagnostic Diagram (image) Chinese Academy of Sciences Headquarters Share Print E-Mail Caption Each point represents one star. Black points are normal stars. Blue and red points represent blue straggler stars belonging to two clear sequences. The blue solid and blue dashed lines are theoretical model predictions. The left sequence is composed of blue straggler stars formed roughly at the same time. Credit NAOC Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.