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Entering orbit…
Habitability
12/ 100
Uninhabitable

SPECULOOS-3b

0

Rocky Terrestrial

Magnetic FieldHigh Activity
Why is this a Rocky Terrestrial?Your planet is dominated by silicate (36.0%) and iron (24.0%) 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: 36.0% + Iron: 24.0% + Magnesium: 4.0%✓ Mass: 0.9x Earth (terrestrial range)
Habitability ScoreUninhabitable
12
Contributing Factors
water0
No water - the recipe has no hydrogen and oxygen to form it
geology90
Active geology recycles nutrients and drives carbon cycle
rotation60
Fast rotation - strong global wind patterns and weather systems, but manageable
Organic Chemistry20
Limited organic chemistry potential
atmosphere10
No atmosphere - exposed to radiation and temperature extremes
temperature40
Extreme temperature - very difficult for life
magnetic Field100
Magnetic field provides radiation protection

Physical Properties

Mass
0.90x Earth (5.37e+24 kg)
Radius
0.97x Earth (6,151 km)
This planet: 0.97× Earth radiusEarth: 1× (baseline)
Surface Gravity
0.97x Earth (9.5 m/s²)
Surface Temperature
393 K (120 °C / 248 °F)
Rotation Period
15.0 hours/day (faster than Earth)
This planet: 15 h/dayEarth: 24 h/day

Orbital Environment

Star Type
M-type (Red Dwarf)
Distance from Star
0.10 AU (15 million km)
Orbital Period
21 days

Atmosphere

Minimal or none

Elemental Composition

Si - Silicon
36.0%
Fe - Iron
24.0%
Na - Sodium
20.0%

Surface Characteristics

Rocky surface with impact craters, possible volcanic features

Closest Real Exoplanet

TOI-6716 b97% similar
Orbiting TOI-6716
YoursTOI-6716 b
Mass0.90 × Earth0.91 × Earth
Radius0.98 × Earth0.98 × Earth
Density (composition)5.19 g/cm³5.30 g/cm³
Temperature393.2 K369.0 K
Starlight received4.00 × Earth4.40 × Earth
Star temperature3,050 K3,110 K
Discovered 2026 via transit · 62 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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