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Home GRACE-FO will measure monthly changes in gravitational pull resulting from changes in Earth’s mass below the orbiting satellites. As the satellites orbit Earth, one following the other, these moving masses alter the gravitational pull below them, changing the distance between them very slightly. (NASA/JPL-Caltech) GRACE-FO will measure monthly changes in gravitational pull resulting from changes in Earth's mass below the orbiting satellites. As the satellites orbit Earth, one following the other, these moving masses alter the gravitational pull below them, changing the distance between them very slightly. (NASA/JPL-Caltech)

GRACE-FO will measure monthly changes in gravitational pull resulting from changes in Earth’s mass below the orbiting satellites. As the satellites orbit Earth, one following the other, these moving masses alter the gravitational pull below them, changing the distance between them very slightly. (NASA/JPL-Caltech)

GRACE-FO will measure monthly changes in gravitational pull resulting from changes in Earth's mass below the orbiting satellites. As the satellites orbit Earth, one following the other, these moving masses alter the gravitational pull below them, changing the distance between them very slightly. (NASA/JPL-Caltech)

GRACE-FO will measure monthly changes in gravitational pull resulting from changes in Earth’s mass below the orbiting satellites. As the satellites orbit Earth, one following the other, these moving masses alter the gravitational pull below them, changing the distance between them very slightly. (NASA/JPL-Caltech)