https://www.ligo.caltech.edu/news/ligo20181203http://www.aei.mpg.de/2313942/four-more-binary-black-hole-mergers-detectedThe observed BBHs span a wide range of component masses, from 7.6 to 50.6 solar masses. The new event GW170729 is the most massive and distant gravitational-wave source ever observed. In this coalescence, which happened roughly 5 billion years ago, an equivalent energy of almost five solar masses was converted into gravitational radiation.
