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Worldlines visualizes special relativity, as particles near lightspeed trace paths in a 3D slice of 4D Minkowski spacetime. Scenes illustrate time dilation, the twin paradox, length contraction, and Bell's spaceship paradox.
Light Speed! is an OpenGL-based program which interactively illustrates the effects of special relativity on the appearance of moving objects. When an object accelerates beyond (roughly) two hundred million meters per second, these strange effects become