Revolutionary!
The GRACE mission, launched on March 12, 2002, flew twin spacecraft around Earth to measure tiny variations in gravity, and revolutionized our view of how water moves on our planet over its 15 years of operation.
A retrospective: https://go.nasa.gov/47e6HoZ
#NASAhistory
GRACE Mission: 15 Years of Watching Water on Earth
In 15 years of operations, the GRACE satellite mission has dramatically changed our view of how water moves and is stored on Earth.NASA
CDunn
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