Gravitational Lensing of a Black Hole

Gravitational Lensing of a Black Hole : According to Einstein’s Theory of Relativity, the intense gravity of a black hole can bend light into a circle called an Einstein Ring. See also Event horizon, Schwarzschild radius, photon sphere. The following code is only an approximation:
(* runtime: 30 seconds *)
Clear[stars]; SeedRandom[535]; stars[{x_, y_}] = Sum[Exp[-500((x - Random[])^2 + (y - Random[])^2)/Random[]^2], {10}];
DensityPlot[Module[{r = x^2 + y^2}, If[r 275, PlotRange -> {0, 1}, Mesh -> False, Frame -> False]



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