Rogue black hole

Since black holes emit no light, the only ways to detect them are gravitational lensing or x-ray bursts that occur when they destroy an object.

[2] These are objects without a host galactic group, caused by collisions between two galaxies or when the merging of two black holes is disrupted.

It has been estimated that there could be 12 rogue supermassive black holes on the edge of the Milky Way galaxy.

[3] In January 2022, a team of astronomers reported of OGLE-2011-BLG-0462/MOA-2011-BLG-191, the first unambiguous detection and mass measurement of an isolated stellar black hole using the Hubble Space Telescope together with the Microlensing Observations in Astrophysics (MOA) and the Optical Gravitational Lensing Experiment (OGLE).

[4][1][5] This black hole is located 5,000 light-years away, has a mass 7.1 times that of the Sun, and moves at about 45 km/s.