Ombre de trou noir & disque

Visualize a spinning (Kerr) black hole’s characteristic radii and a stylized accretion disk.

• Horizon r₊ = M(1+√(1−a⋆²))
• Photon orbit (equatorial) r_ph±/M = 2(1+cos((2/3)arccos(∓a⋆)))
• ISCO from the Bardeen formula (prograde and retrograde)
• Shadow critical curve ≈ √27 M for Schwarzschild, with a mild spin correction; angular size θ ≈ r_sh/D

The WebGL view shows the horizon, photon ring, shadow silhouette (shifted with spin), and a Keplerian disk with Doppler beaming on the approaching side. Press Render to build the scene. Not a full GR ray tracer.