EntityQ2134013· pop 8· linked from 200 articlesRaychaudhuri equationSign in to saveresult in general relativityConnectionsStephen HawkingPersongeodesic curveEntitycausal structureEntityenergy conditionEntityAlbert EinsteinPersonBlack holeConceptgravityEntityInternational Standard Book NumberEntityDavid HilbertEntitytheory of relativityEntityspeed of light in vacuumEntityHenri PoincaréEntityspecial relativityEntitygeneral relativityEntityHendrik LorentzEntitydigital object identifierEntityspacetimeEntityLev LandauEntityNewton's law of universal gravitationEntityRoger PenroseEntityCategoriesGeneral relativityLev Landau