Greenland flyover by GRACE

The force of gravity not only keeps us from floating away, it also lets NASA study Earth’s water and ice from space. Using a pair of twin satellites named "GRACE," we can monitor ou...

One of the GRACE satellites undergoes thermal testing at IABG in Germany.

GRACE being readied for launch - 1

The GRACE satellites are seen at an IABG testing facility in Germany.

GRACE being readied for launch - 2

One of the twin GRACE satellites, Flight Model 1, is seen on a trolley during construction in Germany.

GRACE contribution to atmospheric studies explained.

NASA’s Gravity Recovery and Climate Experiment (GRACE) has measured significant groundwater depletion around the world in recent years. These animations show trends in total water storage from Jan....

The GRACE satellites during component integration in a German clean room.

GRACE on orbit - 1

Research based on GRACE observations indicates that between 2002 and 2016, Greenland shed approximately 280 gigatons of ice per year.

One of the twin GRACE spacecraft is seen during construction in Germany.

This animation illustrates the highs and lows of the Earth's gravity field as water in the basins of the U.S. changes over time.

Global ocean conveyor belt of warm and cold water is explained.

The twin GRACE satellites are seen in a clean room in Germany in 2002.

Between 2002 and 2016, Antarctica shed approximately 125 gigatons of ice per year, causing global sea level to rise by 0.35 millimeters per year.

The original GRACE satellites in a clean room in Germany.

GRACE satellites are mounted belly to belly at an IABG testing facility in Germany.

For 15 years, the GRACE mission has unlocked mysteries of how water moves around our planet. It gave us the first view of underground aquifers from space, and shows how fast polar ice sheets and mo...

Twin GRACE spacecraft being deployed from Breeze

GPS signal occultation by the atmosphere, and the resulting useful data is explained.