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We only keep your email and the username you choose. We never share or sell your email, and we don't send marketing — we use it only to email you a sign-in code. Learn more.

About TerraForge

TerraForge is a planet-building tool and an exoplanet reference, built to make planetary science tangible instead of abstract.

What you can do here

Mix elements, pick a star, add moons, and watch the simulation classify what you've built — rocky, gas giant, water world, and more — then simulate billions of years of evolution in seconds. Save a world and share it with a link, or browse what other people have built.The same engine also renders every planet in NASA's Exoplanet Archive that has enough measured data to simulate — thousands of real, confirmed worlds, each built from its actual measured mass, orbit, and star, not a guess.

The physics, honestly

The simulation is a model, not a lab: it uses real relationships between mass, density, stellar radiation, and composition to classify a planet, but it simplifies where a full physical simulation would be impractical for something that needs to run instantly in a browser. Where the model and a real exoplanet's own measurements disagree, the page says so rather than quietly picking one over the other — see the note on any exoplanet page.

Built with

Next.js, Three.js, and Space UI.

Questions or feedback

Reach out through the contact page, or read the guide for a full walkthrough of the builder.
The TerraForge exoplanet catalog: 5,572 real exoplanets run through the simulation, with a search field and rendered worlds grouped by type

New: The Exoplanet Catalog 🔭

Every confirmed planet NASA has measured well enough to build — 5,572 of them — is now in here, and none of them arrived with a label. Their real mass, radius, orbit and star go through the same simulation that runs everything you make, and it decides what each one is: gas giant, lava world, ocean, ice. Sixteen come out Earth-like. Find TRAPPIST-1e, stand on its surface, and see what a red dwarf's light actually looks like from the ground.

Create your free account

Enter your email and we'll send a 6-digit code — no password needed.
We only keep your email and the username you choose. We never share or sell your email, and we don't send marketing — we use it only to email you a sign-in code. Learn more.

Send feedback

We're still building out the best experience we can — and we'd love your input. Tell us about features you enjoy, ideas you'd like to see, or pain points where something feels off, and we'll know where to look next.

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