 which is a few years ago, but a little bit before that, there was the announcement of the detection of the gravitational waves that was produced by black holes. Since there are so many black holes in the sky, they can meet and fall into one another. They fall into one another, they start orbiting, turning around, then orbiting faster and faster, getting closer and closer, faster, faster, faster, faster, faster, closer, closer, closer, then whoop!