Welcome, Cosmic Architect.
You are about to build a solar system from scratch — and discover just how rare a stable, life-bearing world truly is.
A starter solar system — modelled on our own — is already waiting for you. Press Play to watch it in motion, then drag objects from the left panel onto the canvas to add your own.
Drag a planet from the left panel and drop it anywhere. A circular orbital velocity is auto-calculated. You can fine-tune the speed before confirming placement.
Experiment freely — add stars, crash planets, break the system. The chaos will teach you how extraordinarily fine-tuned a life-bearing world must be.
Reset the entire simulation?
All objects will be removed.