GRACE (IMAGE) University of Maryland Caption The twin satellites of NASA's Gravity Recovery and Climate Experiment (GRACE), active between 2002 and 2016, made detailed measurements of Earth's gravity field, enabling discoveries about gravity and Earth's natural systems. A new study that used GRACE data, coupled with data from other satellites and published reports of human activity, determined global-scale changes in Earth's freshwater supplies. Credit NASA/JPL-Caltech 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.