EntityQ4913879· pop 17· linked from 215 articlesbinary black holeSign in to savesystem consisting of two black holes orbiting each otherConnectionsparsecEntitygravitational waveEntitygravitational lensEntityLaser Interferometer Gravitational Wave ObservatoryEntitycompact objectEntitystellar populationEntitygalaxy mergerEntityexotic starEntityOJ 287EntityKerr–Newman metricEntitymass in general relativityEntityYouTubeConceptBlack holeConceptBig BangEntityInternational Standard Book NumberEntitylight-yearEntityNewton's laws of motionEntitygeneral relativityEntityelectromagnetic radiationEntitywattEntityCategoriesBinary starsBlack holesGravitational waves