This Black Hole is Just 1000 Light Years Away From Earth, The Closest One Known as Yet

The ESO says that the hidden black hole in HR 6819 is one of the very first stellar-mass black holes found that do not interact violently with their immediate environment and, therefore, appear truly black.

from Top Tech News- News18.com
The ESO says that the hidden black hole in HR 6819 is one of the very first stellar-mass black holes found that do not interact violently with their immediate environment and, therefore, appear truly black.