NICER's Mirror Assemblies (IMAGE) NASA/Goddard Space Flight Center Caption NICER's mirror assemblies concentrate X-rays onto silicon detectors to gather data that probes the interior makeup of neutron stars, including those that appear to flash regularly, called pulsars. Credit Credits: NASA's Goddard Space Flight Center/Keith Gendreau 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.