Researchers have discovered the very first rogue black hole, and it’s less than 5,000 light-years away. The astronomers detected and measured the mass of an isolated stellar-mass black hole over the course of several years. They’ve now published their results in a new study.

Previously, all the stellar-mass black holes that we’ve detected were in binary systems. However, the discovery of a rogue black hole could open new mysteries around these space-bound entities. Scientists discovered the black hole around 5,000 light-years away from Earth. It’s located towards the bulge in the center of our galaxy, the Milky Way.

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Astronomers first noted the existence of the rogue black hole in 2011. At the time, the researchers noted a possible microlensing event. Essentially, a microlensing event is when the gravitational force of an object causes the light of a star to bend. This is something often seen around black holes, as they pull the light of nearby stars towards them. It’s also seen around stars or white dwarfs.

Read more: Yahoo