zero-drag satellite
satellite where the payload follows a geodesic path through space
STEP
proposed space science experiment to test the equivalence principle of general relativity
Gravity Probe B
space observatory to test frame dragging and geodetic effect
Laser Interferometer Space Antenna
third large mission of Cosmic Vision; gravitational-wave space observatory
Gravity Field and Steady-State Ocean Circulation Explorer
ESA satellite which mapped Earth's gravity field