LIGO Observatory

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© LIGO Laboratory.

The Laser Interferometer Gravitational Wave Observatory, or LIGO, consists of two giant interferometers in the states of Louisiana and Washington. A gravitational wave will change the relative path length of the two interferometer arms, allowing light to leak through to the detector that is normally in the dark. The two 4 km long arms of the Laser Interferometer Gravitational Wave Observatory at Hanford, Washington are shown in this aerial view. (Unit: 3)