EntityQ1137903· pop 29· linked from 224 articleslight coneSign in to savepath taken by a flash of light through spacetimeConnectionscausal structureEntitytheory of relativityEntityspacetimeEntitygravitational lensEntityinertial frame of referenceEntityMinkowski spacetimeEntityAlbert EinsteinPersonlightEntityBlack holeConceptStephen HawkingPersonMax PlanckEntityInternational Standard Book NumberEntityDavid HilbertEntityangleEntityspeed of light in vacuumEntityvacuumEntityHenri PoincaréEntityspecial relativityEntitygeneral relativityEntityPaul DiracEntityCategoriesConcepts in astrophysicsLightLorentzian manifoldsTheory of relativityTime