Two astronomers recently searched for a large black hole, as they filtered data from the most powerful earth and space observatories, looking for any evidence of an invisible object hundreds of times the mass of the sun in a cloud far from the stars known as “NGC 6397”, but instead they found a nest of small black holes in an area barely larger than our solar system, throwing their considerable weight around in the dense core of the star cluster
Source: While Hunting for a Giant Black Hole, Astronomers Discover a Nest of Darkness