Using the technique of gravitational microlensing, NASA researchers have identified a rogue black hole moving freely in the Milky Way galaxy, where the gravity of the object distorted the light from a far-off star. This stellar-mass black hole, which is the remnant of a long-ago supernova, is the nearest confirmed rogue black hole to our galactic vicinity. Experts predict that there could be as many as 100 million similar entities moving unseen through the galaxy.
