Magnetic Field Low Activity
Why is this a Carbon World? Your planet's carbon (22.4%) outweighs its oxygen (2.0%), 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: 22.4% (>=20% required) ✓ Carbon exceeds Oxygen: 22.4% > 2.0% ✓ Mass: 0.7x Earth (<=8x hycean ceiling)
Habitability Score Extremely Harsh
Contributing Factors water 16
Very dry - minimal water - mostly frozen geology 60
Some geological activity provides slow nutrient cycling rotation 100
Optimal rotation period - balanced day/night cycle, moderate weather, and good heat distribution Organic Chemistry 75
All CHNOPS elements present - building blocks of life - chlorine-laced environment attacks organic molecules atmosphere 40
Atmosphere present but composition not ideal for life temperature 40
Extreme temperature - very difficult for life magnetic Field 100
Magnetic field provides radiation protection Physical Properties Mass
0.70x Earth (4.18e+24 kg) Radius
0.89x Earth (5,657 km) This planet: 0.89× Earth radius Earth: 1× (baseline)
Surface Gravity
0.89x Earth (8.7 m/s²) Surface Temperature
247 K (-26 °C / -15 °F) Rotation Period
23.0 hours/day (faster than Earth) This planet: 23 h/day Earth: 24 h/day Orbital Environment Distance from Star
0.80 AU (120 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 0.00016% - 7.2 radii
Small and distant: a quiet, stable companion.
Moon 2 stable 0.00010% - 23.3 radii
Small and distant: a quiet, stable companion.