In 2016, US scientists for the first time announced their detection of gravitational waves, ripples in space and time hypothesized by Albert Einstein a century ago. Such a discovery represents a scientific breakthrough, opening the door to an entirely new way of observing the cosmos. In 2017, the Nobel Prize in Physics was awarded to three US scientists for the detection of gravitational waves. To better grasp the process of their discovery, CGTN’s Tian Wei spoke to two of them: Rainer Weiss, Emeritus Professor of Physics at MIT and Kip Thorne, Emeritus Professor of Physics at Caltech. Chen Yanbei, Professor of Physics at Caltech, also joined the talk.