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Traditionally, scientists constructed gravity maps using a combination of land measurements, ship records, and more
recently, remote sensing. However, those measurements weren't accurate enough to capture the slight changes in water
movement that cause gravity to vary over time. To better assess these gravity variations, an international team of engineers
and scientists developed the Gravity Recovery and Climate Experiment (GRACE) mission that launched in March 2002.
With GRACE data, scientists can now weigh water as it circulates around the globe and relate these measurements to
changes in sea level, soil moisture, and ice sheets. [Source: NASA Earth System Science Data and Services]
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