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The Gravity Recovery And Climate Experiment (GRACE), a joint mission of NASA and the German Aerospace Centre, has been making detailed measurements of Earth's gravity field since its launch in March 2002.
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NASA Mission Takes Stock of Earths Melting Land Ice

In the first comprehensive satellite study of its kind, a University of Colorado at Boulder-led team used NASA data to calculate how much Earth's melting land ice is adding to global sea level rise.
Using satellite measurements from the NASA/German Aerospace Centre Gravity Recovery and Climate Experiment (GRACE), the researchers measured ice loss in all of Earth's land ice between 2003 and 2010, with particular emphasis on glaciers and ice caps outside of Greenland and Antarctica.

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NASA's Grace Helps Monitor U.S. Drought

The record-breaking drought in Texas that has fuelled wildfires, decimated crops and forced cattle sales has also reduced groundwater levels in much of the state to the lowest levels in more than 60 years, according to new national maps produced by NASA using data from the NASA/German Aerospace Centre Gravity Recovery and Climate Experiment (Grace) mission. The map are distributed by the National Drought Mitigation Centre at the University of Nebraska-Lincoln.
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NASA and DLR Sign Agreement to Continue Grace Mission Through 2015

NASA Deputy Administrator Lori Garver and German Aerospace Centre (DLR) Executive Board Chairman Johann-Dietrich Wörner signed an agreement Thursday during a bilateral meeting in Berlin to extend the Gravity Recovery and Climate Experiment (Grace) mission through the end of its on-orbit life, which is expected in 2015
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Satellites Unlock Secret to Northern India's Vanishing Water
Using NASA satellite data, scientists have found that groundwater levels in northern India have been declining by as much as one foot per year over the past decade. Researchers concluded the loss is almost entirely due to human activity.
More than 26 cubic miles of groundwater disappeared from aquifers in areas of Haryana, Punjab, Rajasthan and the nation's capitol territory of Delhi, between 2002 and 2008. This is enough water to fill Lake Mead, the largest manmade reservoir in the United States, three times.

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The Gravity Recovery and Climate Experiment project launched two satellites in 2002 and they have been collecting data on Earths gravity for the past five years. This data has been used to make the most accurate maps of Earths gravity and how it changes as the planets mass shifts. The data can also be used to understand how changes in Earths ice sheets affect global sea level.

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