Carbon World Magnetic Field Moderate Activity
Why is this a Carbon World? Your planet's carbon (92.9%) outweighs its oxygen (7.1%), 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: 92.9% (>=20% required) ✓ Carbon exceeds Oxygen: 92.9% > 7.1% ✓ Mass: 1.0x 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 20
Limited organic chemistry potential atmosphere 16
Atmosphere present but composition not ideal for life (partially stripped by slow rotation) temperature 100
Optimal temperature range for liquid water and life (large moon stabilizes the axial tilt - steady seasons) magnetic Field 100
Magnetic field provides radiation protection (a large close moon may help stir the core dynamo (speculative)) Physical Properties Mass
1.00x Earth (5.97e+24 kg) Radius
1.00x Earth (6,371 km) This planet: 1.00× Earth radius Earth: 1× (baseline)
Surface Gravity
1.00x Earth (9.8 m/s²) Surface Temperature
280 K (6 °C / 44 °F) Rotation Period
24.0 hours/day This planet: 24 h/day Earth: 24 h/day Orbital Environment Star Type
G-type (Yellow (Sun-like)) Distance from Star
1.00 AU (150 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 Closest Real Exoplanet Orbiting Teegarden's Star Yours Teegarden's Star b Mass 1.00 × Earth 1.16 × Earth Radius 1.12 × Earth 1.05 × Earth Density (composition) 3.90 g/cm³ 5.52 g/cm³ Temperature 279.6 K 277.0 K Starlight received 1.00 × Earth 1.08 × Earth Star temperature 5,600 K 3,034 K
Discovered 2019 via radial velocity · 12 light-years away Source: NASA Exoplanet Archive Browse all 5,568 real exoplanets Learn more about exoplanets Moons
Moon 1 rings 0.063% - 2.0 radii
Inside the Roche limit (2.80 planet radii): torn apart into a ring system.
Moon 2 receding 1.0% - 11.1 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 +5 magneticField: a large close moon may help stir the core dynamo (speculative)