The Fully Assembled OCULLAR Prototype (IMAGE) NASA/Goddard Space Flight Center Caption The fully assembled OCULLAR prototype is pictured on the right. A legacy photomultiplier tube is shown on the top left. A new silicon photodetector microradiometer is on the bottom left. Credit NASA Goddard/Bill Hrybyk 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.