Sign in or create your 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.
Entering orbit…
Habitability
0/ 100
Uninhabitable

Lavayus

0

Lava World

Magnetic FieldExtreme Activity
Why is this a Lava World?Runaway tidal heating from its moons keeps the surface molten - the planet is kneaded like Io, only far harder.
Resonant, close-in moons pump orbital eccentricity, and the resulting tidal flexing dissipates enormous heat in the interior. Past a threshold the crust cannot cool: volcanism resurfaces the world continuously.
Classification Criteria:
✓ Close-in moons in a resonant configuration✓ Tidal heat flux beyond the runaway threshold- Orbit itself was fine: 0.10 AU, 739K equilibrium
Habitability ScoreUninhabitable
0
Contributing Factors
water0
No water - the recipe has no hydrogen and oxygen to form it
geology40
Extreme volcanic activity may be hazardous
rotation10
Near tidally locked - one hemisphere perpetually scorched, other frozen, narrow habitable twilight zone only
Organic Chemistry20
Limited organic chemistry potential
atmosphere16
Atmosphere present but composition not ideal for life (partially stripped by slow rotation)
temperature0
Scorching - hot enough to melt lead, though rock stays solid; no chance for life (large moon stabilizes the axial tilt - steady seasons) (runaway tidal heating keeps the surface molten regardless of orbit)
magnetic Field100
Magnetic field provides radiation protection (a large close moon may help stir the core dynamo (speculative))

Physical Properties

Mass
5.20x Earth (3.11e+25 kg)
Radius
1.73x Earth (11,038 km)
This planet: 1.73× Earth radiusEarth: 1× (baseline)
Surface Gravity
1.73x Earth (17.0 m/s²)
Surface Temperature
739 K (466 °C / 871 °F)
Rotation Period
12.0 hours/day (faster than Earth)
This planet: 12 h/dayEarth: 24 h/day

Orbital Environment

Star Type
SNR-type (Supernova Remnant)
Distance from Star
0.10 AU (15 million km)
Orbital Period
10 days
Time Dilation
Clocks run 6.5 seconds per year slower than deep space — about 9 minutes over a lifetime

Atmosphere

Volcanic outgassing - sulfur compounds and vaporized rock

Elemental Composition

Fe - Iron
26.7%
Si - Silicon
26.7%
Mg - Magnesium
20.0%

Surface Characteristics

Runaway tidal heating keeps the surface molten - volcanic activity everywhere

Closest Real Exoplanet

HD 219134 c92% similar
Orbiting HD 219134
YoursHD 219134 c
Mass5.20 × Earth4.36 × Earth
Radius1.56 × Earth1.51 × Earth
Density (composition)7.52 g/cm³6.98 g/cm³
Temperature739.2 K782.0 K
Starlight received50.0 × Earth62.1 × Earth
Star temperature— 4,699 K
Discovered 2015 via radial velocity · 21 light-years awaySource: NASA Exoplanet Archive
Moons
Moon 1receding5.6% - 7.7 radii

Outside the synchronous orbit: slowly receding, like Luna (~cm per year).

Tidal braking locked the planet to its moon: one face forever moonward.

+5 temperature: large moon stabilizes the axial tilt - steady seasons-85 temperature: runaway tidal heating keeps the surface molten regardless of orbit+5 magneticField: a large close moon may help stir the core dynamo (speculative)
Surface views from three worlds: rocky ground under a ringed sky, a cloud deck, and a lit desert

New: Stand on Your World 🏔️

Every planet you build can now be seen from the ground. The terrain, the color of the sky, the weather and what hangs overhead are all read from the same numbers that shape the globe — so a thin-aired world gives you sunlit rock under a near-black sky crowded with stars, a runaway greenhouse seals you under an unbroken sulfur lid, and a gas giant leaves you in the cloud tops with nothing solid beneath you at all. If one of your moons wandered inside the Roche limit, what is left of it arcs overhead as rings.

Sign in or create your 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.

Type