the latest  measurements involve the use of satellite gravimetry, estimating  the mass of terrain beneath by detecting slight changes in gravity as a  satellite passes overhead.
the latest  measurements involve the use of satellite gravimetry, estimating  the mass of terrain beneath by detecting slight changes in gravity as a  satellite passes overhead.
grace and grace-fo:1
twin satellites took detailed measurements of earth's gravity field anomalies from its launch in march 2002 to the end of its science mission in october 2017.