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Entering orbit…
Habitability
39/ 100
Extremely Harsh

Carbovore

0

Carbon World

Low Activity
Why is this a Carbon World?Your planet's carbon (69.6%) outweighs its oxygen (8.1%), 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: 69.6% (>=20% required)✓ Carbon exceeds Oxygen: 69.6% > 8.1%✓ Mass: 0.8x Earth (<=8x hycean ceiling)
Habitability ScoreExtremely Harsh
39
Contributing Factors
water20
Very dry - minimal water
geology60
Some geological activity provides slow nutrient cycling
rotation10
Near tidally locked - one hemisphere perpetually scorched, other frozen, narrow habitable twilight zone only
Organic Chemistry100
All CHNOPS elements present - building blocks of life
atmosphere16
Atmosphere present but composition not ideal for life (partially stripped by slow rotation)
temperature40
Extreme temperature - very difficult for life
magnetic Field30
No magnetic field - vulnerable to solar radiation

Physical Properties

Mass
0.80x Earth (4.78e+24 kg)
Radius
0.93x Earth (5,914 km)
This planet: 0.93× Earth radiusEarth: 1× (baseline)
Surface Gravity
0.93x Earth (9.1 m/s²)
Surface Temperature
354 K (81 °C / 178 °F)
Rotation Period
2,000.0 hours/day (slower than Earth)
This planet: 2000 h/dayEarth: 24 h/day

Orbital Environment

Star Type
G-type (Yellow (Sun-like))
Distance from Star
0.70 AU (105 million km)
Orbital Period
214 days

Atmosphere

Carbon monoxide and methane haze over a graphite surface

Elemental Composition

C - Carbon
69.6%
N - Nitrogen
8.1%
O - Oxygen
8.1%

Surface Characteristics

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

Closest Real Exoplanet

Kepler-1649 b84% similar
Orbiting Kepler-1649
YoursKepler-1649 b
Mass0.80 × Earth1.03 × Earth
Radius1.06 × Earth1.02 × Earth
Density (composition)3.74 g/cm³5.35 g/cm³
Temperature354.2 K307.0 K
Starlight received2.04 × Earth2.21 × Earth
Star temperature5,600 K3,240 K
Discovered 2017 via transit · 301 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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