LIGO at 10: Listening to the Universe Like Never Before Ten years ago, humanity opened a completely new window on the cosmos. On September 14, 2015, the Laser Interferometer Gravitational-Wave Observatory (LIGO) made history by detecting ripples in space-time—gravitational waves—for the very first time. These waves came from two black holes spiraling together and colliding 1.3 billion years ago, confirming a prediction Albert Einstein made in 1915. That moment was a turning point for astronomy.

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