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Entering orbit…
Habitability
74/ 100
Habitable

Carrabus

by gushas
0

Carbon World

Magnetic FieldModerate Activity
Why is this a Carbon World?Your planet's carbon (20.0%) outweighs its oxygen (8.0%), 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: 20.0% (>=20% required)✓ Carbon exceeds Oxygen: 20.0% > 8.0%✓ Mass: 2.0x Earth (<=8x hycean ceiling)
Habitability ScoreHabitable
74
Contributing Factors
water50
Limited water content
geology90
Active geology recycles nutrients and drives carbon cycle
rotation100
Optimal rotation period - balanced day/night cycle, moderate weather, and good heat distribution
Organic Chemistry100
All CHNOPS elements present - building blocks of life
atmosphere40
Atmosphere present but composition not ideal for life
temperature40
Extreme temperature - very difficult for life
magnetic Field100
Magnetic field provides radiation protection

Physical Properties

Mass
2.00x Earth (1.19e+25 kg)
Radius
1.26x Earth (8,027 km)
This planet: 1.26× Earth radiusEarth: 1× (baseline)
Surface Gravity
1.26x Earth (12.4 m/s²)
Surface Temperature
360 K (87 °C / 188 °F)
Rotation Period
32.0 hours/day (slower than Earth)
This planet: 32 h/dayEarth: 24 h/day

Orbital Environment

Star Type
K-type (Orange)
Distance from Star
0.69 AU (103 million km)
Orbital Period
250 days

Atmosphere

Carbon monoxide and methane haze over a graphite surface

Elemental Composition

Ar - Argon
25.3%
C - Carbon
20.0%
H - Hydrogen
8.0%

Surface Characteristics

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

Closest Real Exoplanet

GJ 3378 b88% similar
Orbiting GJ 3378
YoursGJ 3378 b
Mass2.00 × Earth2.30 × Earth
Radius1.35 × Earth1.32 × Earth
Density (composition)4.45 g/cm³5.51 g/cm³
Temperature359.8 K272.0 K
Starlight received0.84 × Earth0.91 × Earth
Star temperature4,450 K3,340 K
Discovered 2026 via radial velocity · 25 light-years awaySource: NASA Exoplanet Archive
Moons
Moon 1rings0.010% - 4.0 radii

Inside the synchronous orbit: it spiraled inward and was torn apart at the Roche limit (Phobos's fate).

Moon 2stable0.025% - 38.1 radii

Small and distant: a quiet, stable companion.

Moon 3stable0.0013% - 8.9 radii

Small and distant: a quiet, stable companion.

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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