What specific cosmic events, involving the violent merging of two very heavy compact objects like black holes or neutron stars, are the main sources we detect gravitational waves from?

The main sources of detected gravitational waves stemming from the violent merging of two very heavy compact objects are Binary Black Hole (BBH) mergers, Binary Neutron Star (BNS) mergers, and Neutron Star-Black Hole (NSBH) mergers. These compact objects, black holes and neutron stars, are extremely dense celestial bodies, remnants of massive stars that have exhausted their nuclear fuel and undergone gravitational collapse. Gravitational waves themselves are ripples in the fabric of spacetime, caused by the acceleration of massive objects, traveling at the speed of light. They distort the distances between objects as they pass. In a Binary Black Hole (BBH) merger, two black holes orbit each other in a close binary system. A black hole is a region of spacetime where gravity is so strong that nothing, not even light, can escape, formed from the complete gravitational collapse of a very massive star. As these two black holes spiral inward, a process known as inspiral, they continuously emit gravitational wave....