https://www.theregister.co.uk/2017/11/13/the_most_powerful_gravitational_waves_will_be_observable_within_a_decade/ >The most violent gravitational waves in the universe from supermassive black hole prangs will be detected to within ten years, according to research published on Monday. >Gravitational waves were predicted by Albert Einstein and finally discovered in 2015, a century after his theory of general relativity was formalized. Ripples through spacetime are generated when black holes collide. As they combine, a proportion of their mass is converted to energy and radiates away as a gravitational wave.