Einstein used his newly-formulated field equations of general relativity to predict the existence of gravitational waves in 1916. They were finally detected 99 years later by the LIGO gravitational wave observatory, in September 2015.

Einstein used his newly-formulated field equations of general relativity to predict the existence of gravitational waves in 1916. They were finally detected 99 years later by the LIGO gravitational wave observatory, in September 2015.