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An Orbiting Disco Ball Just Gave Einstein's Theory of Gravity Its Most Precise Test Ever

Ars Technica·Monday, 13 July 2026
An Orbiting Disco Ball Just Gave Einstein's Theory of Gravity Its Most Precise Test Ever

Scientists used a small, reflective satellite — described as an orbiting disco ball — to conduct the most precise test yet of Einstein's general theory of relativity. The experiment confirmed that even Earth's relatively modest mass distorts space-time, as Einstein predicted. The results set a new record for precision in testing the theory.

Why It Matters

General relativity underpins GPS, satellite navigation, and much of modern physics. More precise confirmations help scientists trust — and build on — the theory for future technologies.

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