No solid surface — any water is locked in a supercritical mantle and hot ice, not oceans
geology90
Active geology recycles nutrients and drives carbon cycle
rotation10
Near tidally locked - one hemisphere perpetually scorched, other frozen, narrow habitable twilight zone only
Organic Chemistry84
Core organic elements (CHNO) present (tidal pools cycle wet and dry - a boost for prebiotic chemistry) — but the ground itself is radioactive, and no magnetic field shields a world from its own crust
atmosphere12
Hydrogen-rich atmosphere typical of gas giants (partially stripped by slow rotation)
temperature20
Very cold - water frozen, challenging for life
magnetic Field100
Magnetic field provides radiation protection
Physical Properties
Mass
8.00x Earth (4.78e+25 kg)
Radius
2.00x Earth (12,742 km)
Surface Gravity
2.00x Earth (19.6 m/s²)
Surface Temperature
178 K (-96 °C / -140 °F)
Rotation Period
6.0 hours/day (faster than Earth)
Orbital Environment
Star Type
M-type (Red Dwarf)
Distance from Star
0.49 AU (73.3 million km)
Orbital Period
229 days
Atmosphere
Hydrogen and helium with water, methane, and ammonia ices
Elemental Composition
N - Nitrogen
20.4%
U - Uranium
20.4%
H - Hydrogen
16.3%
Surface Characteristics
Icy mantle surrounding rocky core, with hydrogen-helium atmosphere