Primary Mirror Segments (IMAGE) NASA/Goddard Space Flight Center Caption Each one of the primary mirror segments of NASA's James Webb Space Telescope has an assembly with seven actuators called a hexapod. Credit Credits: Ball Aerospace Usage Restrictions None License Licensed content 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.