Planetary Systems

Interactive gravity sandbox: explore the Solar System, TRAPPIST-1, Kepler-90, binary stars and black holes. Grab planets, throw comets and create your own worlds.

Play instantly in your browser. Desktop & Android versions available via the buttons above.

About this game

Planetary Systems is an interactive universe simulator and gravity sandbox that runs right in your browser. Start with the Solar System with all eight planets, the dwarf planets, the asteroid belt and comets Halley and Encke. Then jump to the real exoplanet systems TRAPPIST-1 and Kepler-90, a binary star world, or a system ruled by a black hole. Switch scenarios, tweak the speed, toggle orbits and belts, then interact: grab any planet and drag it to a new orbit, or switch to throw mode to fling it across the system. Add your own planets with the built-in editor, summon black holes, and watch collisions, mass growth and gravitational chaos unfold. Educational, beautiful and endlessly replayable — no install, no download.