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Lorentz Transform — Minkowski DiagramSet velocity β and drag event A on a Minkowski diagram to watch Lorentz transformations… Special Relativity — Time Dilation & Length ContractionPush a spaceship toward light speed and watch the Lorentz factor stretch clocks and shrink… Mass–Energy Equivalence E=mc²Explore Einstein's E=mc² through animated nuclear fission (U-235) and fusion (D-T). See the… Minkowski Spacetime DiagramBoost between reference frames on a spacetime diagram and see world lines tilt, the light… Twin Paradox — Special Relativity Time DilationSend one twin on a round trip near light speed and count the ticks each clock records,… Lorentz Contraction — Length Contraction in Special RelativityAccelerate a rod toward light speed and measure how the gamma factor squeezes its length… Relativity of Simultaneity — Train & Lightning Thought ExperimentTwo lightning strikes appear simultaneous for the platform observer but not for the moving… Schwarzschild Geodesics — Black Hole Orbits & General RelativityGeodesics in Schwarzschild spacetime around a black hole. Photon sphere at 1.5 rs, ISCO at 3… Gravitational Wave Chirp — LIGO Inspiral Waveform InteractiveSet binary masses and distance, watch h(t) strain waveform sweep and chirp, spectrogram,… Relative Simultaneity — Einstein's Train & Lightning Thought ExperimentTrain at adjustable v/c, two lightning bolts, dual animation showing ground and train… Wormhole — Morris–ThorneNewPeer through a traversable Morris–Thorne wormhole rendered as a Flamm-style embedding…