We've seen light waves from space; now we can see gravity waves.
A hundred years ago, Einstein said that gravity waves existed but they'd never been detected. We now know he was correct.
Antennas of the Laser Interferometer Gravitational-Wave Observatory (LIGO) in Washington State and Louisiana have just detected the gravity 'sound' of two black holes coalescing a billion light years away. Previous to the observation, the black holes were responsible for the phenomenon well known as a pulsar, like the famous PSR B1913+16 in the constellation of Aquila.
The black holes collapsed a billion years ago, sending out gravity waves and now remain as a single black hole depleted of some of its mass due to the release of this energy.
Check out the blurb.