gravitational wave; gravity wave
Physics term for ripples in spacetime caused by accelerating massive objects. In English, 'gravity wave' is sometimes used but 'gravitational wave' is more precise.
Gravitational waves were directly observed for the first time in 2015.
Gravitational-wave astronomy provides a new means of observation.
Compound of 重力 (gravity) and 波 (wave). A calque from English 'gravitational wave' or 'gravity wave'.