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Habitability
40/ 100
Marginal

Untitled Gas Dwarf

0

Gas Dwarf

Magnetic FieldLow Activity
Why is this a Gas Dwarf?Your planet has an unusual composition that doesn't fit standard classifications, or lacks the elements needed for complex geological processes.
Barren worlds can form from uncommon element combinations or may be remnants of larger bodies that lost their atmospheres and volatile materials.
Classification Criteria:
Composition doesn't match standard planet typesMass: 4.4x EarthTemperature: 257K
Habitability ScoreMarginal
40
Contributing Factors
water15
No solid surface — any water is locked in a supercritical mantle and hot ice, not oceans
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
atmosphere30
Hydrogen-rich atmosphere typical of gas giants
temperature70
Challenging but potentially habitable temperature
magnetic Field100
Magnetic field provides radiation protection

Physical Properties

Mass
4.40x Earth (2.63e+25 kg)
Radius
1.64x Earth (10,440 km)
This planet: 1.64× Earth radiusEarth: 1× (baseline)
Surface Gravity
1.64x Earth (16.1 m/s²)
Surface Temperature
257 K (-16 °C / 3 °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
1.18 AU (177 million km)
Orbital Period
1.28 years

Atmosphere

Deep hydrogen-helium envelope with photochemical haze

Elemental Composition

H - Hydrogen
36.1%
He - Helium
36.1%
O - Oxygen
27.9%

Surface Characteristics

No solid surface - a thick gas envelope wrapped around a small deep core (a mini-Neptune)

Closest Real Exoplanet

Kepler-443 b84% similar
Orbiting Kepler-443
YoursKepler-443 b
Mass4.40 × Earth6.04 × Earth
Radius2.47 × Earth2.33 × Earth
Density (composition)1.60 g/cm³2.63 g/cm³
Temperature257.0 K233.0 K
Starlight received0.72 × Earth0.86 × Earth
Star temperature5,600 K4,723 K
Discovered 2015 via transit · 2,616 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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