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Habitability
12/ 100
Uninhabitable

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0

Rocky Terrestrial

None Activity
Why is this a Rocky Terrestrial?Your planet is dominated by silicate (100.0%) and iron (0.0%) content, forming a rocky terrestrial body.
Rocky terrestrial planets are primarily composed of silicate rocks and metals. They're the most common type of small planet in the universe.
Classification Criteria:
✓ Silicon: 100.0% + Iron: 0.0% + Magnesium: 0.0%✓ Mass: 0.3x Earth (terrestrial range)
Habitability ScoreUninhabitable
12
Contributing Factors
water0
No water - the recipe has no hydrogen and oxygen to form it
geology30
Geologically dead - no nutrient recycling
rotation30
Very slow rotation - severe temperature swings between eternal day and night sides
Organic Chemistry20
Limited organic chemistry potential
atmosphere10
No atmosphere - exposed to radiation and temperature extremes
temperature70
Challenging but potentially habitable temperature
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)
This planet: 0.67× Earth radiusEarth: 1× (baseline)
Surface Gravity
0.67x Earth (6.6 m/s²)
Surface Temperature
273 K (-0 °C / 32 °F)
Rotation Period
43.0 hours/day (slower than Earth)
This planet: 43 h/dayEarth: 24 h/day

Orbital Environment

Star Type
O-type (Blue Supergiant)
Distance from Star
328.00 AU (49.1 billion km)
Orbital Period
1,085 years

Atmosphere

Minimal or none

Elemental Composition

Si - Silicon
100.0%

Surface Characteristics

Rocky surface with impact craters, possible volcanic features

Closest Real Exoplanet

Kepler-138 e61% similar
Orbiting Kepler-138
YoursKepler-138 e
Mass0.30 × Earth0.43 × Earth
Radius0.73 × Earth0.80 × Earth
Density (composition)4.22 g/cm³4.68 g/cm³
Temperature273.0 K292.0 K
Starlight received0.93 × Earth1.73 × Earth
Star temperature35,000 K3,841 K
Discovered 2022 via transit timing variations · 218 light-years awaySource: NASA Exoplanet Archive
Moons
Moon 1receding0.056% - 17.1 radii

Outside the synchronous orbit: slowly receding, like Luna (~cm per year).

+4 chemistry: tidal pools cycle wet and dry - a boost for prebiotic chemistry
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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