# Orbiting disco ball provides most precise test of Einstein's theory

Scientists used a satellite equipped with a retroreflector, nicknamed a disco ball, to conduct the most precise test of general relativity to date. The experiment measured the satellite's orbit and confirmed Einstein's predictions to within a few parts in a million. This result strengthens our understanding of gravity and could influence future physics theories.

**Importance:** 4/5

## Sources

### Technology
- [Ars Technica](https://arstechnica.com/science/2026/07/an-orbiting-disco-ball-gave-einsteins-theory-its-most-precise-test-yet/) — Fri, 10 Jul 2026 16:11:35 +0000