How To Detect Gravitational Waves – LIGO Simply Explained | Video

On Sept. 14th, 2015, the Laser Interferometer Gravitational-Wave Observatory (LIGO) detected the merger, 1.3 billion years ago, of two black holes. The event caused ripples in spacetime (G-waves), which stretched and squashed our planet just enough for LIGO’s ultra-sensitive instruments to measure. Gravitational Waves Detected by LIGO: Complete Coverage

credit : Caltech