A 15.65 solar mass black hole in an eclipsing binary in the nearby spiral galaxy Messier 33 (2007)
Orosz, Jerome A., McClintock, Jeffrey E., Narayan, Ramesh, Bailyn, Charles D., Hartman, Joel D., Mracri, Lucas, ...
Stellar-mass black holes are discovered in X-ray emitting binary systems, where their mass can be determined from the dynamics of their companion stars. Models of stellar evolution have difficulty...