One hundred years ago Einstein predicted the esoteric phenomena of gravitational waves. Last September they were directly detected for the first time, from the violent collision of two black holes. That event marked the beginning of a new chapter in our study of the cosmos. Cardiff University scientists heavily involved in the LIGO project (Laser Interferometer Gravitational-Wave Observatory) will discuss the experience of making this landmark observation, the incredible science and fascinating personal stories behind it, and what it means for the future of our understanding of the universe. The speakers are both based at the School of Physics and Astronomy. The event is chaired by their colleague Professor Haley Gomez.