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Habitability
0/ 100
Uninhabitable

SIMP-0136

0

Brown Dwarf

Magnetic FieldNone Activity
Why is this a Brown 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: 4186.0x EarthTemperature: 616K
Habitability ScoreUninhabitable
0
Contributing Factors
water15
No solid surface — any water is locked in a supercritical mantle and hot ice, not oceans
geology30
Geologically dead - no nutrient recycling
rotation25
Very fast rotation - perpetual hurricane-force winds, extreme Coriolis effects, hazardous for complex life
Organic Chemistry80
Core organic elements (CHNO) present
atmosphere30
Hydrogen-rich atmosphere typical of gas giants
temperature5
Scorching - hot enough to melt lead, though rock stays solid; no chance for life
magnetic Field100
Magnetic field provides radiation protection

Physical Properties

Mass
4186.00x Earth (2.50e+28 kg)
Radius
16.12x Earth (102,677 km)
This planet: 16.12× Earth radiusEarth: 1× (baseline)
Surface Gravity
16.12x Earth (158.1 m/s²)
Surface Temperature
616 K (343 °C / 649 °F)
Rotation Period
5.0 hours/day (faster than Earth)
This planet: 5 h/dayEarth: 24 h/day

Orbital Environment

Star Type
BH-type (Black Hole)
Distance from Star
47434.20 AU (7.1 trillion km)
Orbital Period
3,266,912 years

Atmosphere

Hydrogen and helium dominated by methane absorption, with water clouds below

Elemental Composition

H - Hydrogen
60.3%
He - Helium
17.7%
C - Carbon
3.5%

Surface Characteristics

No surface: a cooling failed star, its methane atmosphere absorbing so much red light it would look magenta to the eye

Closest Real Exoplanet

CWISEP J193518.59-154620.3 b73% similar
Orbiting CWISEP J193518.59-154620.3
YoursCWISEP J193518.59-154620.3 b
Mass4,186 × Earth4,930 × Earth
Radius16.1 × Earth12.2 × Earth
Density (composition)— 15.0 g/cm³
Temperature616.2 K390.0 K
Starlight received0.00 × Earth—
Star temperature— —
Matched on physical properties only — no confirmed exoplanet orbits a black hole.Discovered 2025 via imaging · 47 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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