A binary black hole (BBH) is when two black holes (black holes) travel in two adjacent orbits.
These two black holes orbit each other. Eventually these two will join.
When binary black holes are joined, a large amount of energy is released. This energy is emitted in the form of gravitational waves. Binary black holes are one of the strongest sources of gravitational waves in the universe.
It was thought that binary black holes were just a fantasy. But in September 2015, ‘LIGO’ (The Laser Interferometer Gravitational-Wave Observatory) said that the binary black hole was not just a fantasy, it was a reality.
With the help of state-of-the-art equipment, LIGO discovered gravitational waves called ‘GW150914’. The source of these waves is said to be 1.3 billion light-years away from the fusion of binary black holes.
It is thought to be a black hole 30 times the size of the Sun. The energy of the GW150914 gravitational waves emitted during the last 20 milliseconds of this fusion is equal to 3 times the energy of our Sun.