LIGO did the deed. Gravational waves have been discovered, thus validating the last prediction of Einstein's General Theory of Relativity penned 100 years ago regarding the existence of Gravitons. The implications of this discovery are truly staggering as Gravitons, the no longer theoretical carriers of gravity, can now be integrated into a possible viable Theory Of Everything in ways not possible prior to the success of LIGOs persistent research into finding out that gravational waves do indeed exist and have so since the beginning of time.
This discovery comes at the culmination of decades of instrument research and development, through a world-wide effort of thousands of researchers, and made possible by dedicated support for LIGO from the National Science Foundation. It also proves a prediction made 100 years ago by Einstein that gravitational waves exist. More excitingly, it marks the beginning of a new era of gravitational wave astronomy – the possibilities for discovery are as rich and boundless as they have been with light-based astronomy.
How cool is that? :)
The mother of all mergers. :)