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Entering orbit…
Habitability
55/ 100
Marginal

Mars

0

Rocky Terrestrial

None Activity
Why is this a Rocky Terrestrial?Your planet is dominated by silicate (19.5%) and iron (26.0%) 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: 19.5% + Iron: 26.0% + Magnesium: 3.9%✓ Mass: 0.3x Earth (terrestrial range)
Habitability ScoreMarginal
55
Contributing Factors
water34
Water present but mostly frozen (low gravity lets water escape to space)
geology30
Geologically dead - no nutrient recycling
rotation100
Optimal rotation period - balanced day/night cycle, moderate weather, and good heat distribution
Organic Chemistry80
Core organic elements (CHNO) present
atmosphere70
Nitrogen atmosphere provides protection but not breathable
temperature40
Extreme temperature - very difficult 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)
This planet: 0.67× Earth radiusEarth: 1× (baseline)
Surface Gravity
0.67x Earth (6.6 m/s²)
Surface Temperature
232 K (-41 °C / -42 °F)
Rotation Period
24.0 hours/day
This planet: 24 h/dayEarth: 24 h/day

Orbital Environment

Star Type
G-type (Yellow (Sun-like))
Distance from Star
1.53 AU (229 million km)
Orbital Period
1.89 years

Atmosphere

Thin CO₂ and nitrogen atmosphere

Elemental Composition

Fe - Iron
26.0%
O - Oxygen
19.5%
Si - Silicon
19.5%

Surface Characteristics

Rocky surface with impact craters, possible volcanic features

Closest Real Exoplanet

KOI-4978 b77% similar
Orbiting KOI-4978
YoursKOI-4978 b
Mass0.30 × Earth0.27 × Earth
Radius0.73 × Earth0.70 × Earth
Density (composition)4.22 g/cm³4.35 g/cm³
Temperature232.0 K—
Starlight received0.43 × Earth—
Star temperature5,600 K5,050 K
Discovered 2024 via transit · 3,053 light-years awaySource: NASA Exoplanet Archive
Moons
Moon 1stable0.00014% - 6.7 radii

Small and distant: a quiet, stable companion.

Moon 2stable0.00010% - 7.2 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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