The conversation between human and AI assistant.
Can a black hole consume another black hole?
This is fascinating. Can you tell me more about gravitational waves?
Certainly! Gravitational waves are ripples in the fabric of spacetime itself, and they are caused by accelerating masses. They were first predicted by Albert Einstein's theory of general relativity in 1915, but it wasn't until 2015 that we were able to directly detect them using advanced laser interferometers. Gravitational waves can tell us a lot about the universe, including the nature of black holes and the origin of the universe itself.