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 90
Active geology recycles nutrients and drives carbon cycle rotation 10
Near tidally locked - one hemisphere perpetually scorched, other frozen, narrow habitable twilight zone only Organic Chemistry 54
Carbon and hydrogen present - organic chemistry possible (tidal pools cycle wet and dry - a boost for prebiotic chemistry) atmosphere 16
Atmosphere present but composition not ideal for life (partially stripped by slow rotation) temperature 45
Extreme temperature - very difficult for life (large moon stabilizes the axial tilt - steady seasons) 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
362 K (89 °C / 192 °F) Rotation Period
20.0 hours/day (faster than Earth) This planet: 20 h/day Earth: 24 h/day Orbital Environment Star Type
G-type (Yellow (Sun-like)) Distance from Star
0.59 AU (88.3 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 10% - 55.4 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 +4 chemistry: tidal pools cycle wet and dry - a boost for prebiotic chemistry