The Laser Interferometer Gravitational-Wave Observatory (LIGO) is a large-scale physics experiment and observatory to detect cosmic gravitational waves and to develop gravitational-wave observations as an astronomical tool. Two large observatories were built in the United States with the aim of detecting gravitational waves by laser interferometry. These can detect a change in the 4 km mirror spacing of less than a ten-thousandth the charge diameter of a proton. The equipment makes observations in “runs” and is used to observe black hole mergers, neutron star mergers, and other events involving gravitational waves.

Laser Interferometer Gravitational-Wave Observatory, Laser Interferometer Gravitational Wave Observatory
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