Timing Is Everything (VIDEO) NASA/Goddard Space Flight Center This video is under embargo. Please login to access this video. To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Caption Deputy Systems Engineer Phil Luers explains how ICESat-2's ATLAS instrument transmitter and receiver subsystems come together to calculate the timing of photons, which, in turn, measure the elevation of ice. Credit NASA'S Goddard Space Flight Center/Ryan Fitzgibbons 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.