Earth's Gravity Field (IMAGE) NASA/Goddard Space Flight Center Caption Knowledge of Earth's gravity field formerly was based on data from geodetic satellites (left). GRACE data is more than 100 times more accurate, characterizing how Earth's gravity field varies over time and space (right). Data from emerging atom-optics technology may be even more accurate. 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.