Spacetime Explorer

Explore general relativity through interactive 3D spacetime curvature. Choose a scenario to begin.

Schwarzschild Spacetime

Earth-Sun Orbit

Weak-field nearly Newtonian elliptical orbit

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Mercury Perihelion Precession

Classic GR prediction of orbital precession

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Stable Circular Orbit

Exact circular geodesic at r = 70M (Venus-like distance)

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Near-ISCO Orbit

Stable circular orbit just above the ISCO at r = 7M

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Plunge Orbit

Spiraling past the event horizon

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Photon Sphere

Near-critical photon orbit grazing r = 3M

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Gravitational Lensing

Multiple photon paths bending around mass

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Kerr Spacetime

Rotating Black Hole

Kerr spacetime with ergosphere and frame dragging

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Prograde vs Retrograde

Co- and counter-rotating orbits compared

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Kerr Plunge

Frame-dragged spiral into a spinning black hole

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Kerr Photon Orbit

Spin-dependent photon sphere

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Dynamical Spacetimes

Binary Black Holes & Gravitational Waves

Inspiral, merger and ringdown — the GW150914 story

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Neutron Star Orbiting a Black Hole

A stable orbit radiating continuous gravitational waves

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