Magnetic Field Moderate Activity
Why is this a Carbon World? Your planet's carbon (29.5%) outweighs its oxygen (1.2%), 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: 29.5% (>=20% required) ✓ Carbon exceeds Oxygen: 29.5% > 1.2% ✓ Mass: 0.7x 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 60
Fast rotation - strong global wind patterns and weather systems, but manageable Organic Chemistry 50
Carbon and hydrogen present - organic chemistry possible 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
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
189 K (-84 °C / -120 °F) Rotation Period
8.0 hours/day (faster than Earth) This planet: 8 h/day Earth: 24 h/day Orbital Environment Star Type
B-type (Blue Giant) Distance from Star
216.40 AU (32.4 billion km) Orbital Period
1,007 years 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 Teegarden's Star d 65% similar
Orbiting Teegarden's Star Yours Teegarden's Star d Mass 0.70 × Earth 0.82 × Earth Radius 1.02 × Earth 0.95 × Earth Density (composition) 3.64 g/cm³ 5.20 g/cm³ Temperature 189.0 K 159.0 K Starlight received 0.21 × Earth 0.12 × Earth Star temperature 20,000 K 3,034 K
Discovered 2024 via radial velocity · 12 light-years away Source: NASA Exoplanet Archive Moons
Moon 1 stable 0.0028% - 22.5 radii
Small and distant: a quiet, stable companion.
Moon 2 stable 0.0045% - 76.1 radii
Small and distant: a quiet, stable companion.
