Magnetic Field High Activity
Why is this a Carbon World? Your planet's carbon (23.4%) 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: 23.4% (>=20% required) ✓ Carbon exceeds Oxygen: 23.4% > 0.0% ✓ Mass: 0.5x 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 25
Very fast rotation - perpetual hurricane-force winds, extreme Coriolis effects, hazardous for complex life Organic Chemistry 50
Carbon and hydrogen present - organic chemistry possible atmosphere 40
Atmosphere present but composition not ideal for life temperature 5
Scorching - hot enough to melt lead, though rock stays solid; no chance for life magnetic Field 100
Magnetic field provides radiation protection Physical Properties Mass
0.50x Earth (2.99e+24 kg) Radius
0.79x Earth (5,057 km) This planet: 0.79× Earth radius Earth: 1× (baseline)
Surface Gravity
0.79x Earth (7.8 m/s²) Surface Temperature
702 K (428 °C / 803 °F) Rotation Period
4.0 hours/day (faster than Earth) This planet: 4 h/day Earth: 24 h/day Orbital Environment Star Type
G-type (Yellow (Sun-like)) Distance from Star
0.20 AU (29.9 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