Unprecedented discovery: Two massive black holes found closest to Earth.

Two black holes, ten times more massive than the Sun, were discovered by astronomers using data from the European Space Agency's Gaia mission. The black holes, named Gaia BH1 and Gaia BH2, are located just 1,560 light-years away from Earth and have the most widely separated orbits of all known black holes. They were detected by observing the movements of their companion stars, making them the first "practically invisible" black holes to be discovered. The discovery suggests that many more similar black holes in wide binaries are still waiting to be found.