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Entering orbit…
Habitability
0/ 100
Uninhabitable

Kepler-37 b

Rocky TerrestrialUninhabitable208 light years awayFound 2013

Kepler-37 b, from the NASA Exoplanet Archive (found 2013). Measured: 0.79 Earth masses, 0.102 AU, a 5357 K G-type star. Composition inferred from a measured bulk density of 26.52x Earth's, far too high for silicates alone — an iron-rich world, with an assumed 24-hour day — rotation cannot be measured for exoplanets.

Host star

Kepler-37

Type
G-type (Yellow (Sun-like))
Temperature
5,357 K
Radius
0.789 ☉
Mass
0.79 ☉
Known planets
4, including this one
Luminosity
0.477 ☉

Published by the NASA Exoplanet Archive. This world’s temperature and habitability score are computed from this star’s measured luminosity, not from a stand-in for its class.

Rocky Terrestrial

Magnetic FieldLow Activity
Why is this a Rocky Terrestrial?Your planet is dominated by silicate (36.6%) and iron (24.4%) 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: 36.6% + Iron: 24.4% + Magnesium: 12.2%✓ Mass: 0.8x Earth (terrestrial range)
Further reading
The Little Book of ExoplanetsJoshua WinnHow these worlds are found, and what a measurement can honestly tell us.Exoplanets: Diamond Worlds, Super Earths, Pulsar PlanetsMichael Summers & James TrefilThe strange end of the catalogue — carbon worlds, molten rock, planets orbiting dead stars.Envisioning ExoplanetsMichael CarrollWhat these worlds might look like from the ground, painted from the same measurements this page renders.Imagined LifeJames Trefil & Michael SummersWhat could live on a world like this one: ice shells, supergravity, tidally locked twilight.
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Habitability ScoreUninhabitable
0
Contributing Factors
temperature5
Scorching - hot enough to melt lead, though rock stays solid; no chance for life
atmosphere10
No atmosphere - exposed to radiation and temperature extremes
water0
No water - the recipe has no hydrogen and oxygen to form it
magnetic Field100
Magnetic field provides radiation protection
geology60
Some geological activity provides slow nutrient cycling
Organic Chemistry20
Limited organic chemistry potential
rotation100
Optimal rotation period - balanced day/night cycle, moderate weather, and good heat distribution

Physical Properties

Mass
0.79x Earth (4.72e+24 kg)
Radius
0.92x Earth (5,890 km)
This planet: 0.92× Earth radiusEarth: 1× (baseline)
Surface Gravity
0.92x Earth (9.1 m/s²)
Surface Temperature
723 K (450 °C / 842 °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
0.10 AU (15.3 million km)
Orbital Period
12 days

Atmosphere

Minimal or none

Elemental Composition

Si - Silicon
36.6%
Fe - Iron
24.4%
Mg - Magnesium
12.2%

Surface Characteristics

Rocky surface with impact craters, possible volcanic features
The TerraForge exoplanet catalog: 5,572 real exoplanets run through the simulation, with a search field and rendered worlds grouped by type

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Every confirmed planet NASA has measured well enough to build — 5,572 of them — is now in here, and none of them arrived with a label. Their real mass, radius, orbit and star go through the same simulation that runs everything you make, and it decides what each one is: gas giant, lava world, ocean, ice. Sixteen come out Earth-like. Find TRAPPIST-1e, stand on its surface, and see what a red dwarf's light actually looks like from the ground.

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