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the laser interferometer gravitational-wave observatory (ligo) consists of two widely separated installations within the united states — one in hanford washington and the other in livingston, louisiana — operated in unison as a single observatory. ligo is operated by the ligo laboratory, a consortium of the california institute of technology (caltech) and the massachusetts institute of technology (mit). funded by the national science foundation, ligo is an international resource for both physics and astrophysics.