Real-time Solar System
Every tracked satellite and half a million asteroids, where they are right now
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Black Hole Raytracer
Fly a camera past a Schwarzschild black hole and watch light bend, in a browser
It turns general relativity's light-bending into something you can steer with arrow keys, which no textbook diagram manages.
An interactive browser visualisation by Dmitry Brant that traces light along curved-spacetime geodesics around a non-rotating black hole on the GPU. You orbit and zoom, fly with W/S and the arrow keys, add an accretion disc, planets or mirrored spheres, and turn a curvature slider to exaggerate the effect. The page is candid that the disc skips relativistic Doppler shifts. Free, no sign-up.
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