A Robotic Arm (IMAGE) NASA/Goddard Space Flight Center Caption A robotic arm called the Primary Mirror Alignment and Integration Fixture is used to lift and lower each of Webb's 18 primary flight mirror segments to their locations on the telescope structure. Credit NASA/Chris Gunn 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.