Magnetic Field Moderate Activity
Why is this a Carbon World? Your planet's carbon (53.9%) outweighs its oxygen (14.7%), 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: 53.9% (>=20% required) ✓ Carbon exceeds Oxygen: 53.9% > 14.7% ✓ Mass: 1.5x 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 100
Optimal rotation period - balanced day/night cycle, moderate weather, and good heat distribution Organic Chemistry 20
Limited organic chemistry potential atmosphere 40
Atmosphere present but composition not ideal for life temperature 20
Very cold - water frozen, challenging for life magnetic Field 100
Magnetic field provides radiation protection Physical Properties Mass
1.50x Earth (8.96e+24 kg) Radius
1.14x Earth (7,293 km) This planet: 1.14× Earth radius Earth: 1× (baseline)
Surface Gravity
1.14x Earth (11.2 m/s²) Surface Temperature
148 K (-125 °C / -193 °F) Rotation Period
24.0 hours/day This planet: 24 h/day Earth: 24 h/day Orbital Environment Distance from Star
3.60 AU (539 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 d Mass 1.50 × Earth 0.82 × Earth Radius 1.25 × Earth 0.95 × Earth Density (composition) 4.21 g/cm³ 5.20 g/cm³ Temperature 147.9 K 159.0 K Starlight received 0.03 × Earth 0.12 × Earth Star temperature 4,450 K 3,034 K
Discovered 2024 via radial velocity · 12 light-years away Source: NASA Exoplanet Archive Browse all 5,568 real exoplanets Learn more about exoplanets