On January 4th, 2017, LIGO detected two black holes merging into one. One of the black holes was 32 times the mass of the Sun while the other was 19 times the mass of the Sun. When they merged, they created a black hole 49 times the mass of the Sun. The coalescence instantly converted 2 solar masses of black hole mass into the energy that rattled spacetime enough to generate the gravitational waves we detected almost 3 billion years after it occurred. (Caltech/MIT/LIGO Lab) https://www.ligo.caltech.edu/news/ligo20170601
June 27, 2017