A binary black hole is a binary system whose two components are black holes. Gravitational waves carry away orbital energy and angular momentum, gradually reducing the separation; sufficiently close systems progress through inspiral, merger and the settling of the final black hole. The increasing orbital angular velocity produces a signal whose gravitational-wave frequency rises, called a chirp. In GW150914, two LIGO interferometers recorded a signal sweeping from about 35 to 250 hertz in September 2015. Comparing that measured gravitational wave strain with general relativity waveforms inferred the component masses and the merger's properties. This permits the study of systems that need no luminous surrounding gas to be detected.[ref]
A binary black hole system consists of two black holes that are in orbit around each other. These systems are significant in the field of astrophysics for a number of reasons: 1. **Formation**: Binary black holes can form from the gravitational collapse of massive stars in a binary star system. When these stars exhaust their nuclear fuel, they undergo supernova explosions, potentially leaving behind black holes.
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