What does LIGO stand for?
Large Infrared Galactic Observatory
Luminous Intergalactic Gamma-ray Observatory
Laser Interferometer Gravitational-Wave Observatory
Long-Range Interstellar Geomagnetic Observatory
Answer
LIGO stands for Laser Interferometer Gravitational-Wave Observatory. The LIGO observatories are located in Hanford, Washington, and Livingston, Louisiana. The observatories are designed to detect gravitational waves, which are ripples in spacetime that are predicted by Albert Einstein's general theory of relativity. The observatories use laser interferometry to measure changes in the length of their arms caused by gravitational waves.
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