New supercomputer simulations suggest the Milky Way could be surrounded by dozens more faint, undetected satellite ...

A puzzling gravitational wave was detected, and astronomers have determined that it comes from a record-breaking black hole ...

Gravitational waves spotted by LIGO reveal two black holes, 140 and 100 times the mass of the sun, merged to become a 225 solar mass behemoth.

How astronomers used gravitational lensing, a space-time trick predicted by Einstein, to detect a black hole measuring 30 ...