A "black hole triple" system has been discovered for the first time, scientists announced.

Black holes have only been spotted on their own or in a binary until this discovery, with a single star, neutron star or other black hole companion orbiting tightly around them.

Now, according to a new paper in the journal Nature, the black hole V404 Cygnus has two stars orbiting around it at varying distances.

This first-of-its-kind discovery could help unravel the mysteries of how black holes form and how they enter into binaries or triples, researchers said........