LARES-2 Measures Earth Frame-Dragging to 0.1%, Confirming General Relativity
Updated
Updated · Nature.com · Jul 8
LARES-2 Measures Earth Frame-Dragging to 0.1%, Confirming General Relativity
3 articles · Updated · Nature.com · Jul 8
Summary
A LARES-2 analysis measured terrestrial frame-dragging with one-part-in-a-thousand relative uncertainty, delivering an order-of-magnitude precision gain over previous Solar System tests.
The result came from combining laser-ranging data from LARES-2 with LAGEOS and GRACE satellites, using LARES-2’s optimized orbit, low surface-to-mass ratio and uniform retroreflector layout.
The measurement strongly matched general relativity’s prediction for spacetime dragging by Earth’s rotation and tightened limits on alternative gravity models, including Chern-Simons scalar-tensor extensions.
The same LARES-2 and LAGEOS dataset also sharpened estimates of Earth’s lunisolar tides, extending the mission’s value beyond fundamental physics into geophysics.
Could unknown forces, not frame-dragging, be responsible for the tiny wobbles in these satellite orbits?
How does measuring spacetime's drag on Earth help us hunt for effects from exotic objects like black holes?
What happens if Einstein's theory finally fails at the next level of precision?
LARES-2 Sets New Benchmark in Frame-Dragging Measurement: Unprecedented 0.1% Precision Validates Einstein’s Theory
Overview
The LARES-2 mission marks a major scientific achievement by confirming Earth's frame-dragging effect—predicted by Einstein's general relativity—with unmatched precision. Specifically designed to measure these subtle gravitational effects, LARES-2 uses a highly optimized orbit and a low surface-to-mass ratio to minimize interference. Its precise data provides crucial evidence for how massive, rotating objects like Earth drag spacetime around them. This breakthrough not only strengthens the foundation of general relativity but also sets a new standard for future experiments testing the nature of gravity.