No life — too cold for liquid water Magnetic Field Extreme Activity
Why is this a Gas Giant? Your planet has 81.7% hydrogen and helium, combined with a mass of 21.0x Earth, which exceeds the gas giant threshold. Gas giants form when massive cores capture enormous atmospheres of light gases. They typically form beyond the 'frost line' where volatiles can condense.
✓ Hydrogen + Helium: 81.7% (>60% required) ✓ Mass: 21.0x Earth (>10x required)
Habitability Score Uninhabitable
Contributing Factors water 15
No solid surface — any water is locked in a supercritical mantle and hot ice, not oceans geology 40
Extreme volcanic activity may be hazardous rotation 10
Near tidally locked - one hemisphere perpetually scorched, other frozen, narrow habitable twilight zone only Organic Chemistry 100
All CHNOPS elements present - building blocks of life (tidal pools cycle wet and dry - a boost for prebiotic chemistry) atmosphere 12
Hydrogen-rich atmosphere typical of gas giants (partially stripped by slow rotation) temperature 10
Frozen world - minimal potential for complex life magnetic Field 100
Magnetic field provides radiation protection Physical Properties Mass
21.00x Earth (1.25e+26 kg) Radius
2.76x Earth (17,577 km) This planet: 2.76× Earth radius Earth: 1× (baseline)
Surface Gravity
2.76x Earth (27.1 m/s²) Surface Temperature
91 K (-182 °C / -296 °F) Rotation Period
9.0 hours/day (faster than Earth) This planet: 9 h/day Earth: 24 h/day Orbital Environment Star Type
G-type (Yellow (Sun-like)) Distance from Star
9.50 AU (1.42 billion km) Atmosphere Hydrogen and helium dominated with trace methane and ammonia
Surface Characteristics No solid surface - thick gaseous envelope with possible rocky core deep within Moons
Moon 1 rings 0.095% - 2.2 radii
Inside the synchronous orbit: it spiraled inward and was torn apart at the Roche limit (Phobos's fate).
Moon 2 stable Ocean world 0.010% - 7.9 radii
Small and distant: a quiet, stable companion.
A thin tidal-warmed subsurface ocean may exist, but conditions are marginal (2/100).
Moon 3 stable Ocean world 0.045% - 11.7 radii
Small and distant: a quiet, stable companion.
A thin tidal-warmed subsurface ocean may exist, but conditions are marginal (3/100).
Moon 4 stable 0.040% - 27.2 radii
Small and distant: a quiet, stable companion.
Moon 5 receding 0.056% - 63.0 radii
Outside the synchronous orbit: slowly receding, like Luna (~cm per year).
+4 chemistry: tidal pools cycle wet and dry - a boost for prebiotic chemistry