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Entering orbit…
Habitability
30/ 100
Extremely Harsh

Saturn

by Aidan8Planets29
0

Gas Giant

✦ Solar System
Magnetic FieldExtreme Activity
Why is this a Gas Giant?Your planet has 86.0% hydrogen and helium, combined with a mass of 10.1x Earth, which exceeds the gas giant threshold.
Gas giants form when massive cores capture enormous atmospheres of light gases. They typically form beyond the 'frost line' where volatiles can condense.
Classification Criteria:
✓ Hydrogen + Helium: 86.0% (>60% required)✓ Mass: 10.1x Earth (>10x required)
Habitability ScoreExtremely Harsh
30
Contributing Factors
water15
No solid surface — any water is locked in a supercritical mantle and hot ice, not oceans
geology40
Extreme volcanic activity may be hazardous
rotation10
Near tidally locked - one hemisphere perpetually scorched, other frozen, narrow habitable twilight zone only
Organic Chemistry84
Core organic elements (CHNO) present (tidal pools cycle wet and dry - a boost for prebiotic chemistry)
atmosphere12
Hydrogen-rich atmosphere typical of gas giants (partially stripped by slow rotation)
temperature15
Frozen world - minimal potential for complex life (large moon stabilizes the axial tilt - steady seasons)
magnetic Field100
Magnetic field provides radiation protection (a large close moon may help stir the core dynamo (speculative))

Physical Properties

Mass
10.10x Earth (6.03e+25 kg)
Radius
2.16x Earth (13,772 km)
This planet: 2.16× Earth radiusEarth: 1× (baseline)
Surface Gravity
2.16x Earth (21.2 m/s²)
Surface Temperature
91 K (-182 °C / -296 °F)
Rotation Period
10.0 hours/day (faster than Earth)
This planet: 10 h/dayEarth: 24 h/day

Orbital Environment

Star Type
G-type (Yellow (Sun-like))
Distance from Star
9.42 AU (1.41 billion km)
Orbital Period
28.9 years

Atmosphere

Hydrogen and helium dominated with trace methane and ammonia

Elemental Composition

H - Hydrogen
53.8%
He - Helium
32.3%
C - Carbon
5.4%

Surface Characteristics

No solid surface - thick gaseous envelope with possible rocky core deep within

Closest Real Exoplanet

GJ 1151 c87% similar
Orbiting GJ 1151
YoursGJ 1151 c
Mass10.1 × Earth10.6 × Earth
Radius3.50 × Earth3.25 × Earth
Density (composition)1.30 g/cm³1.70 g/cm³
Temperature90.8 K88.0 K
Starlight received0.01 × Earth0.01 × Earth
Star temperature5,600 K3,280 K
Discovered 2023 via radial velocity · 26 light-years awaySource: NASA Exoplanet Archive
MoonsLife may exist on a moon
Moon 1rings0.050% - 1.5 radii

Inside the Roche limit (1.79 planet radii): torn apart into a ring system.

Moon 2rings0.089% - 2.3 radii

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

Moon 3stable0.00032% - 7.2 radii

Small and distant: a quiet, stable companion.

Tidal braking locked the planet to its moon: one face forever moonward.

Moon 4stableOcean world0.035% - 11.0 radii

Small and distant: a quiet, stable companion.

A thin tidal-warmed subsurface ocean may exist, but conditions are marginal (2/100).

Moon 5stable0.00079% - 19.2 radii

Small and distant: a quiet, stable companion.

Moon 6recedingOcean world - life0.0020% - 29.3 radii

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

Tidal heat sustains a subsurface ocean over a rock seafloor: a strong candidate for life (Europa-like, 95/100).

Moon 7stable0.0014% - 40.5 radii

Small and distant: a quiet, stable companion.

Moon 8merged5.6% - 32.2 radii

Merged with an adjacent moon: too close for both to hold a stable orbit.

+5 temperature: large moon stabilizes the axial tilt - steady seasons+4 chemistry: tidal pools cycle wet and dry - a boost for prebiotic chemistry+5 magneticField: a large close moon may help stir the core dynamo (speculative)
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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