EntityQ2361910· pop 15· linked from 131 articlesphoton sphereSign in to savespherical area or region of space where gravity is strong enough that massless particles are forced to travel in orbitsConnectionsSchwarzschild metricEntitystellar populationEntityKerr metricEntityexotic starEntityKerr–Newman metricEntityBlack holeConceptBig BangEntityspeed of light in vacuumEntityphotonEntitysupernovaEntitydigital object identifierEntityInternational Standard Serial NumberEntityneutron starEntitywhite dwarfEntityquasarEntitygravitational waveEntityNewtonian gravitational constantEntitycentrifugal forceEntitycentripetal forceEntityangular velocityEntityCategoriesBlack holesGeneral relativity