An article published in the journal “Science” reports the discovery of what could be the lowest-mass known black hole, perhaps even the first of a new class of black holes. A team of researchers led by Professor Todd Thompson of Ohio State University used data from APOGEE (Apache Point Observatory Galactic Evolution Experiment) to discover a binary system that includes an invisible object that could be a black hole. If instead it were a neutron star it would be by far the most massive known, far beyond the theoretical highest limit before the collapse of such an object into a black hole.