The Laser Interferometer Gravitational-Wave Observatory (LIGO)

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The Laser Interferometer Gravitational-Wave Observatory (LIGO)

  • 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 initial LIGO observatories were funded by the National Science Foundation (NSF).
  • They collected data from 2002 to 2010 but no gravitational waves were detected.
  • In 2017, the Nobel Prize in Physics was awarded to Rainer Weiss, Kip Thorne and Barry C. Barish “for decisive contributions to the LIGO detector and the observation of gravitational waves.”

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