Using data from ESA’s Gaia mission, astronomers have discovered a nearby binary system composed of a giant star orbiting a dormant black hole of of stellar origin in 11.6 years. The estimated mass of the black hole (33 solar masses) is substantially higher than all known stellar-mass black holes in the Milky Way and is in the mass range of the extragalactic black holes detected by gravitational waves. The location of the first three black holes...