Behind the image
Light rays follow numerically integrated null geodesics in Schwarzschild spacetime. The dark shadow is larger than the event horizon. The arch is the far side of the disk, bent into view.
Nonrotating black hole · thin disk at 3–10 rₛ · approximate Doppler shading · artistic emission. This is an educational visualization, not an observational prediction.
The light-bending equation ↗