LIGO is a 2019 American documentary film that tells the inside account of the discovery by the international LIGO Scientific Collaboration of the first observation of gravitational waves in September 2015, a discovery that led two years later to the Nobel Prize in Physics for LIGO physicists Rai Weiss, Kip Thorne and Barry Barish. In December 2019, National Geographic named the LIGO detections at the top of its list of "The 20 Top Scientific Discoveries of the Decade".