The star S2 orbits the Milky Way's central black hole every 16 years at 7,650 km/s (2.5% the speed of light). Its path has tested general relativity in a gravitational field a thousand times stronger than anywhere Einstein's equations had been verified before (GRAVITY Collaboration, A&A 2020)

The star S2 orbits the Milky Way's central black hole every 16 years at 7,650 km/s (2.5% the speed of light). Its path has tested general relativity in a gravitational field a thousand times stronger than anywhere Einstein's equations had been verified before (GRAVITY Collaboration, A&A 2020)