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Carbon World
✦ Sau centi systemNone Activity
Why is this a Carbon World?Your planet's carbon (100.0%) 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.
Classification Criteria:
✓ Carbon: 100.0% (>=20% required)✓ Carbon exceeds Oxygen: 100.0% > 0.0%✓ Mass: 0.3x Earth (<=8x hycean ceiling)
Habitability ScoreUninhabitable
Contributing Factors
water0
No water - the recipe has no hydrogen and oxygen to form it
geology40
Geologically dead - no nutrient recycling (tidal flexing sustains geologic activity)
rotation10
Near tidally locked - one hemisphere perpetually scorched, other frozen, narrow habitable twilight zone only
Organic Chemistry20
Limited organic chemistry potential
atmosphere16
Atmosphere present but composition not ideal for life (partially stripped by slow rotation)
temperature0
Near absolute zero - all molecular activity ceases, impossible for life
magnetic Field30
No magnetic field - vulnerable to solar radiation
Physical Properties
Mass
0.30x Earth (1.79e+24 kg)Radius
0.67x Earth (4,265 km)Surface Gravity
0.67x Earth (6.6 m/s²)Surface Temperature
2 K (-271 °C / -456 °F)Rotation Period
24.0 hours/dayOrbital Environment
Star Type
G-type (Yellow (Sun-like))Distance from Star
15000.00 AU (2.24 trillion km)Orbital Period
1,837,117 yearsAtmosphere
Carbon monoxide and methane haze over a graphite surface
Elemental Composition
C - Carbon
100.0%
Surface Characteristics
Graphite plains and carbide ridges over a diamond mantle - a glittering coal-black worldClosest Real Exoplanet
No close real-world analog — your planet is one of a kind among the confirmed exoplanets in the NASA Exoplanet Archive.Browse all 5,568 real exoplanetsLearn more about exoplanetsMoons
Moon 1rings1.3% - 1.2 radii
Inside the Roche limit (2.80 planet radii): torn apart into a ring system.
Moon 2recedingSilicate rock0.010% - 14.9 radii
Outside the synchronous orbit: slowly receding, like Luna (~cm per year).
Tidal braking locked the planet to its moon: one face forever moonward.
Moon 3receding0.00079% - 47.1 radii
Outside the synchronous orbit: slowly receding, like Luna (~cm per year).
Moon 4merged0.056% - 52.7 radii
Merged with an adjacent moon: too close for both to hold a stable orbit.
Moon 5merged0.0016% - 21.7 radii
Merged with an adjacent moon: too close for both to hold a stable orbit.
Moon 6merged0.00079% - 19.0 radii
Merged with an adjacent moon: too close for both to hold a stable orbit.
Moon 7recedingWater ice0.0016% - 27.7 radii
Outside the synchronous orbit: slowly receding, like Luna (~cm per year).
Moon 8merged0.011% - 7.7 radii
Merged with an adjacent moon: too close for both to hold a stable orbit.
Moon 9merged0.028% - 31.0 radii
Merged with an adjacent moon: too close for both to hold a stable orbit.
Moon 10stableNitrogen & methane ice0.0045% - 56.3 radii
Small and distant: a quiet, stable companion.
Cold enough for nitrogen and methane to lie as frost on the surface (Triton-like).
Moon 11merged0.014% - 28.4 radii
Merged with an adjacent moon: too close for both to hold a stable orbit.
Moon 12rings0.045% - 5.4 radii
Inside the synchronous orbit: it spiraled inward and was torn apart at the Roche limit (Phobos's fate).
Moon 13stable0.040% - 18.2 radii
Small and distant: a quiet, stable companion.
Moon 14merged0.040% - 8.4 radii
Merged with an adjacent moon: too close for both to hold a stable orbit.
Moon 15receding0.028% - 6.9 radii
Outside the synchronous orbit: slowly receding, like Luna (~cm per year).
Moon 16receding0.035% - 9.4 radii
Outside the synchronous orbit: slowly receding, like Luna (~cm per year).
Moon 17receding0.040% - 35.4 radii
Outside the synchronous orbit: slowly receding, like Luna (~cm per year).
Moon 18merged0.040% - 8.2 radii
Merged with an adjacent moon: too close for both to hold a stable orbit.
Moon 19merged0.045% - 16.0 radii
Merged with an adjacent moon: too close for both to hold a stable orbit.
Moon 20stable0.028% - 23.2 radii
Small and distant: a quiet, stable companion.
Moon 21merged0.040% - 38.6 radii
Merged with an adjacent moon: too close for both to hold a stable orbit.
Moon 22merged0.050% - 29.6 radii
Merged with an adjacent moon: too close for both to hold a stable orbit.
Moon 23merged0.063% - 10.0 radii
Merged with an adjacent moon: too close for both to hold a stable orbit.
Moon 24recedingWater ice0.063% - 85.7 radii
Outside the synchronous orbit: slowly receding, like Luna (~cm per year).