Image: Two black holes are entwined in a gravitational tango in this artist's conception. Credit: NASA A binary black hole (BBH) is a system consisting of two black holes in close orbit around each other. Binary black holes are often divided into stellar binary black holes, formed either as remnants of high-mass binary star systems or by dynamic processes and mutual capture, and binary supermassive black holes believed to be a result of galactic mergers.
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