Learn why orbits exist through a guided tour from two bodies to Voyager slingshots to curved spacetime

A Three.js solar-system model that walks through Newton's pull, inertia, falling-and-missing, cosmic velocities and real Voyager gravity assists, then ends on Einstein's rubber-sheet picture. You can switch between true and visual scale and between Kepler and N-body mode.

Notes

Maker says the physics may contain inaccuracies and invites corrections. Ships with a CLAUDE.md and Claude co-authored commits in the repo (checked on GitHub); the page itself names no tool. Has optional music and EN/ZH/PL narration.