NICER (IMAGE) NASA/Johnson Space Center Caption This is the Neutron Star Interior Composition Explorer (NICER) payload, affixed to the exterior of the space station, will study the physics of neutron stars, providing new insight into their nature and behavior Credit NASA 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.