<p>The Gravity field and Ocean Circulation Explorer (GOCE) mission’s main objective was to measure Earth's gravity in unprecedented detail using a highly sensitive gradiometer. GOCE's data provided scientists with an improved understanding of ocean circulation, sea level change, and glacial dynamics. GOCE also produced the first global gravity model of Earth with a spatial resolution of less than 100 km.</p>

Electrostatic Gravity Gradiometer (EGG): Measured Earth's gravity field in all directions with a set of six three-axis accelerometers.

Satellite to Satellite Tracking Instrument (SSTI): Supplemented the gradiometer measurements and measured Earth's gravity field by tracking the satellite's position and velocity with high precision.

SSTI

Star Tracker (STR): An optical camera system, designed to measure the orientation of the satellite with respect to the stars

Magnetometers (MGM): Used for magnetic torquer control and as rate sensors.

Laser Retro Reflector (LRR): Used to precisely determine the satellite's position in orbit.