Hubble researchers find a gaggle of small black holes

Larger black holes may be the usual attention-getters, but the smaller ones may be at least as important. A team using the Hubble Space Telescope has discovered a concentration of small black holes in the NGC 6397 globular star cluster (pictured abov...

source https://www.engadget.com/hubble-concentration-of-black-holes-215420800.html