LIGO

"In 2015, the Laser Interferometer Gravitational-Wave Observatory, or LIGO, made history when it made the first direct detection of gravitational waves, or ripples in space and time, produced by a pair of colliding black holes."

https://www.ligo.caltech.edu/news/ligo20231023?utm_source=join1440&utm_medium=email&utm_placement=newsletter