Two weeks ago, the Laser Interferometer Gravitational-Wave Observatory (LIGO) collaboration announced the first direct observation of gravitational waves. The signal was emitted by two black holes colliding together 1.3 billion years ago forming a single black hole 62 times more massive than our Sun. The collision created gravitational energy ripples that travelled through the Universe. The two multi-kilometer-scale LIGO detectors located in Hanford, Washington, USA and in Livingston, Louisiana, USA, have now detected these ripples in the fabric of spacetime.