Magnetic Field High Activity
Why is this a Carbon World? Your planet's carbon (22.2%) outweighs its oxygen (3.9%), 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: 22.2% (>=20% required) ✓ Carbon exceeds Oxygen: 22.2% > 3.9% ✓ Mass: 3.5x Earth (<=8x hycean ceiling)
Habitability Score Extremely Harsh
Contributing Factors water 20
Very dry - minimal water geology 90
Active geology recycles nutrients and drives carbon cycle rotation 30
Very slow rotation - severe temperature swings between eternal day and night sides Organic Chemistry 84
Core organic elements (CHNO) present (tidal pools cycle wet and dry - a boost for prebiotic chemistry) atmosphere 24
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
3.50x Earth (2.09e+25 kg) Radius
1.52x Earth (9,673 km) This planet: 1.52× Earth radius Earth: 1× (baseline)
Surface Gravity
1.52x Earth (14.9 m/s²) Surface Temperature
146 K (-127 °C / -196 °F) Rotation Period
30.0 hours/day (slower than Earth) This planet: 30 h/day Earth: 24 h/day Orbital Environment Star Type
G-type (Yellow (Sun-like)) Distance from Star
3.65 AU (546 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 stable 0.032% - 11.0 radii
Small and distant: a quiet, stable companion.
Moon 2 stable 0.045% - 36.5 radii
Small and distant: a quiet, stable companion.
+4 chemistry: tidal pools cycle wet and dry - a boost for prebiotic chemistry