Habitability
0/ 100
Uninhabitable

The Unusal world of Lava

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: 4.00 AU, 139K equilibrium
Habitability ScoreUninhabitable
0
Contributing Factors
water60
Water present but mostly frozen
geology40
Extreme volcanic activity may be hazardous
rotation10
Near tidally locked - one hemisphere perpetually scorched, other frozen, narrow habitable twilight zone only
Organic Chemistry80
Core organic elements (CHNO) present
atmosphere16
Atmosphere present but composition not ideal for life (partially stripped by slow rotation)
temperature0
Very cold - water frozen, challenging 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
0.80x Earth (4.78e+24 kg)
Radius
0.93x Earth (5914 km)
Surface Gravity
0.93x Earth (9.1 m/s²)
Surface Temperature
139 K (-134 °C / -209 °F)
Rotation Period
18.0 hours/day (faster than Earth)

Orbital Environment

Star Type
G-type (Yellow (Sun-like))
Distance from Star
4.00 AU (598391483 million km)

Atmosphere

Volcanic outgassing - sulfur compounds and vaporized rock

Elemental Composition

O - Oxygen
35.3%
H - Hydrogen
17.6%
Si - Silicon
17.6%

Surface Characteristics

Runaway tidal heating keeps the surface molten - volcanic activity everywhere

Closest Real Exoplanet

Teegarden's Star d80% similar
Orbiting Teegarden's Star
YoursTeegarden's Star d
Mass0.80 × Earth0.82 × Earth
Radius0.93 × Earth0.95 × Earth
Temperature139.0 K159.0 K
Starlight received0.06 × Earth0.12 × Earth
Star temperature5,600 K3,034 K
Discovered 2024 via radial velocity · 12 light-years awaySource: NASA Exoplanet Archive
Moons
Moon 1rings0.10% - 2.8 radii

Inside the Roche limit (2.80 planet radii): torn apart into a ring system.

Moon 2merged0.10% - 7.5 radii

Merged with an adjacent moon: too close for both to hold a stable orbit.

Moon 3receding0.10% - 19.8 radii

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

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

Moon 4merged0.10% - 9.9 radii

Merged with an adjacent moon: too close for both to hold a stable orbit.

Moon 5receding0.10% - 5.5 radii

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

Moon 6receding0.10% - 9.1 radii

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

Moon 7merged0.26% - 7.1 radii

Merged with an adjacent moon: too close for both to hold a stable orbit.

Moon 8merged0.10% - 6.1 radii

Merged with an adjacent moon: too close for both to hold a stable orbit.

Moon 9merged0.10% - 6.1 radii

Merged with an adjacent moon: too close for both to hold a stable orbit.

Moon 10merged10% - 52.7 radii

Merged with an adjacent moon: too close for both to hold a stable orbit.

+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)