"Gravitational waves are created by any object that spins, such as the rotating remnants of stellar corpses, orbiting black holes or even two people “doing a do-si-do,” Dr. Mingarelli said. But unlike other types of waves, these ripples stretch and squeeze the very fabric of space-time, warping the distances between any celestial objects they pass by.
“It sounds very sci-fi,” Dr. Mingarelli said. “But it’s for real.”"
https://www.nytimes.com/2023/06/28/science/astronomy-gravitational-waves-nanograv.html