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.

Planet Types

Every kind of world the simulation can produce, what makes each one form, and how to build it yourself.

Water Worlds

Ocean planets in the habitable zone.

Earth-like Planets

Balanced rocky worlds that can host life.

Brown Dwarfs

Failed stars: too heavy to be planets, too light to burn hydrogen.

Gas Giants

Massive hydrogen and helium worlds.

Ice Giants

Cold Neptune-like worlds with icy mantles.

Ice Worlds

Frozen worlds far from their star.

Lava Worlds

Molten worlds scorched by their star.

Volcanic Worlds

Cold worlds kept molten from within by their moons.

Venus-like Planets

Runaway greenhouse worlds.

Rocky Planets

Silicate and iron terrestrial worlds.

Desert Worlds

Dune seas under a permanent wind-borne dust haze.

Salt Worlds

Blinding evaporite flats on dry, salt-crusted rocks.

Exotic Terrestrials

Temperate worlds crusted in minerals no Earth rock knows.

Carbon Worlds

Graphite-black planets with diamond mantles.
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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