Carbon World Magnetic Field Moderate Activity
Why is this a Carbon World? Your planet's carbon (52.3%) outweighs its oxygen (0.0%), so the mineralogy flips from silicate rock to carbide - a graphite crust over a diamond mantle. Carbon worlds form in carbon-rich disks where there isn't enough oxygen to bind it all into silicates. Instead carbon condenses directly into graphite, carbides, and - under pressure at depth - diamond. They form water-poor, so no life takes hold.
✓ Carbon: 52.3% (>=20% required) ✓ Carbon exceeds Oxygen: 52.3% > 0.0% ✓ Mass: 1.8x Earth (<=8x hycean ceiling)
Habitability Score Uninhabitable
Contributing Factors water 0
No water - the recipe has no hydrogen and oxygen to form it geology 100
Active geology recycles nutrients and drives carbon cycle (tidal flexing sustains geologic activity) rotation 10
Near tidally locked - one hemisphere perpetually scorched, other frozen, narrow habitable twilight zone only Organic Chemistry 50
Carbon and hydrogen present - organic chemistry possible atmosphere 16
Atmosphere present but composition not ideal for life (partially stripped by slow rotation) temperature 20
Very cold - water frozen, challenging for life magnetic Field 100
Magnetic field provides radiation protection Physical Properties Mass
1.80x Earth (1.07e+25 kg) Radius
1.22x Earth (7,750 km) This planet: 1.22× Earth radius Earth: 1× (baseline)
Surface Gravity
1.22x Earth (11.9 m/s²) Surface Temperature
186 K (-88 °C / -126 °F) Rotation Period
20.0 hours/day (faster than Earth) This planet: 20 h/day Earth: 24 h/day Orbital Environment Distance from Star
1.42 AU (212 million km) Atmosphere Carbon monoxide and methane haze over a graphite surface
Surface Characteristics Graphite plains and carbide ridges over a diamond mantle - a glittering coal-black world Moons
Moon 1 receding 0.22% - 6.0 radii
Outside the synchronous orbit: slowly receding, like Luna (~cm per year).
Tidal braking locked the planet to its moon: one face forever moonward.
+10 geology: tidal flexing sustains geologic activity