Star orbits so close to Milky Way's black hole that spacetime twists around it

Astronomers have found that a star orbiting very close to the Milky Way's central supermassive black hole has an orbit tightly linked to the black hole's spin, demonstrating a spacetime-twisting effect known as Lense-Thirring precession. The finding could allow scientists to measure the black hole's spin precisely for the first time — a characteristic that has long been difficult to determine.