"Gravitational-wave observatory" . "gravitational wave interferometer" . . "gravitational-wave observatories (detectors)" . "gravitational wave-observatory" . "ground-based detectors" . . "gravitational-wave (GW) detectors." . "gravitational wave sensor" . . . "LIGO detector" . . . "gravitational wave observatories" . "Gravitational-wave observatory#Interferometers" . . "gravitational-wave detection" . . "gravitational-wave detectors" . "Gravitational-wave observatory#Laser interferometers" . . . "gravitational-wave observatories" . "gravitational-wave space observatories" . "gravitational-wave detector" . "gravity wave observation" . "Gravitational-wave observatory" . "Gravitational wave detectors" . "gravitational-wave observatory" . "gravitational wave detectors" .