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Entering orbit…
Habitability
12/ 100
Uninhabitable

Cargo

0

Carbon World

Magnetic FieldLow Activity
Why is this a Carbon World?Your planet's carbon (33.3%) outweighs its oxygen (9.6%), 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: 33.3% (>=20% required)✓ Carbon exceeds Oxygen: 33.3% > 9.6%✓ Mass: 0.6x Earth (<=8x hycean ceiling)
Habitability ScoreUninhabitable
12
Contributing Factors
water0
No water - the recipe has no hydrogen and oxygen to form it
geology60
Some geological activity provides slow nutrient cycling
rotation100
Optimal rotation period - balanced day/night cycle, moderate weather, and good heat distribution
Organic Chemistry20
Limited organic chemistry potential
atmosphere40
Atmosphere present but composition not ideal for life
temperature100
Optimal temperature range for liquid water and life
magnetic Field100
Magnetic field provides radiation protection

Physical Properties

Mass
0.60x Earth (3.58e+24 kg)
Radius
0.84x Earth (5,374 km)
This planet: 0.84× Earth radiusEarth: 1× (baseline)
Surface Gravity
0.84x Earth (8.3 m/s²)
Surface Temperature
297 K (24 °C / 76 °F)
Rotation Period
30.0 hours/day (slower than Earth)
This planet: 30 h/dayEarth: 24 h/day

Orbital Environment

Star Type
G-type (Yellow (Sun-like))
Distance from Star
0.95 AU (142 million km)
Orbital Period
338 days

Atmosphere

Carbon monoxide and methane haze over a graphite surface

Elemental Composition

C - Carbon
33.3%
Si - Silicon
13.6%
S - Sulfur
10.7%

Surface Characteristics

Graphite plains and carbide ridges over a diamond mantle - a glittering coal-black world

Closest Real Exoplanet

TOI-700 e84% similar
Orbiting TOI-700
YoursTOI-700 e
Mass0.60 × Earth0.82 × Earth
Radius0.98 × Earth0.95 × Earth
Density (composition)3.54 g/cm³5.21 g/cm³
Temperature297.3 K273.0 K
Starlight received1.11 × Earth1.27 × Earth
Star temperature5,600 K3,459 K
Discovered 2023 via transit · 101 light-years awaySource: NASA Exoplanet Archive
Surface views from three worlds: rocky ground under a ringed sky, a cloud deck, and a lit desert

New: Stand on Your World 🏔️

Every planet you build can now be seen from the ground. The terrain, the color of the sky, the weather and what hangs overhead are all read from the same numbers that shape the globe — so a thin-aired world gives you sunlit rock under a near-black sky crowded with stars, a runaway greenhouse seals you under an unbroken sulfur lid, and a gas giant leaves you in the cloud tops with nothing solid beneath you at all. If one of your moons wandered inside the Roche limit, what is left of it arcs overhead as rings.

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