LAGEOS (LAser GEOdynamics Satellite)

Earth Science
Earth
Earth Surface & Interior
General
GRACE (Gravity Recovery And Climate Experiment)
GRACE-FO (Gravity Recovery and Climate Experiment Follow-on)
Jet Propulsion Laboratory
LAGEOS (LAser GEOdynamics Satellite)
Oceans
Water on Earth
Seasonal changes redistribute enough water around Earth to shift the planet’s center of mass back and forth by fractions of an inch relative to its geometric center. NASA scientists are on the case, tracking the oscillations because Earth’s center of mass is a crucial reference point for satellite navigation and elevation measurements.
Posted September 16, 2026
LAGEOS (LAser GEOdynamics Satellite)
NASA History
On May 4, 1976, a spacecraft resembling a disco ball entered orbit almost 3,700 miles (6,000 kilometers) above Earth. This shiny, two‑foot‑wide (60‑centimeter) sphere called the Laser Geodynamics Satellite, or LAGEOS, is covered with 426 retroreflectors—small mirrored prisms designed to bounce laser light directly back to where it came from.
Posted May 4, 2026
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