Doppler: Use default Always on Always off Absolute positions: Use default Always on Always off Apparent positions: Use default Always on Always off Debug mode:

You need a browser that supports canvas to view this simulation.

Firefox 3.6+, a recent version of Google Chrome, Safari 4+ or Opera 10+ are recommended.

Firefox 2+, any version of Google Chrome, Safari 3.2+, Opera 9+ and IE8 should work with some missing features.

Choose a demo

Keyboard Controls

w, a, s and d, or arrow keys: Accelerate
q and e: Rotate left and right (yaw)
3: Show 3D view
t: Toggle clock display.
p: Toggle coordinate display.
Page up/down: Zoom in and out
space: Fire photon (rasteroids only).
h: Toggle help screen.
Press Next to advance to the next step in a demonstration.
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Welcome to the jsphys relativity simulator. Choose a demonstration to start with and hit Play.