LIGO resumes work in 2023 with gravitational wave upgrades

Following two years of upgrades, the Laser Interferometer Gravitational-Wave Observatory (LIGO) is almost ready for its next operating run, which is set to begin in March 2023.

During this fourth operating run (O4) LIGO — which comprises two detectors, one in Washington and one in Louisiana — will be joined by two other gravitational wave observatories: the Virgo interferometer, in Italy, and the Kamioka Gravitational Wave Detector (KAGRA), in Japan.

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