planetaria
A free particle demo — play it in your browser, no install. Newtonian N-body simulator in Javascript/HTML5
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Controls: Click & drag: spawn a particle; drag vector sets initial velocity
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Open the live demo Source on GitHubFrom the README
Newtonian *N*-body simulator in JavaScript / HTML5.
Integration uses a leapfrog (velocity-Verlet) scheme. A softening term avoids singular forces at very small separations. An optional time-transformed leapfrog is available to improve stability during close encounters by automatically shrinking the physical timestep near collisions.
Live demo — the page spawns a large stationary object; click-drag on the canvas to add particles (drag length sets initial velocity).
Integrates with a fixed step in a fictitious time $s$ and uses $dt = f(\mathbf r)\,ds$ with $f$ small during close approaches.
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