Create your free account

Enter your email and we'll send a 6-digit code — no password needed.
We only keep your email and the username you choose. We never share or sell your email, and we don't send marketing — we use it only to email you a sign-in code. Learn more.
Entering orbit…
Habitability
0/ 100
Uninhabitable

Kepler-28 b

Gas WispUninhabitable1428 light years awayFound 2011

Kepler-28 b, from the NASA Exoplanet Archive (found 2011). Measured: 1.63 Earth masses, 0.0569 AU, a 4499 K K-type star. Composition inferred from a measured bulk density of 0.22x Earth's, which only hydrogen and helium can explain, with a day locked to its 5.9-day year, as anything orbiting this close would be. Note: TerraForge comes out at 761 K against the archive's 585 K, because it models stars by spectral class, and Kepler-28 is not an average K-type.

Host star

Kepler-28

Type
K-type (Orange)
Spectral type
M0 V
Temperature
4,499 K
Radius
0.664 ☉
Mass
0.684 ☉
Known planets
2, including this one
Luminosity
0.180 ☉

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.

Gas Wisp

None Activity
Why is this a Gas Wisp?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: 1.6x EarthTemperature: 761K
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.
As an Amazon Associate I earn from qualifying purchases — if you buy through these links, TerraForge may receive a small commission at no extra cost to you.
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
water15
No solid surface — any water is locked in a supercritical mantle and hot ice, not oceans
magnetic Field30
No magnetic field - vulnerable to solar radiation
geology30
Geologically dead - no nutrient recycling
Organic Chemistry80
Core organic elements (CHNO) present
rotation30
Very slow rotation - extreme temperature swings between eternal day and night sides

Physical Properties

Mass
1.63x Earth (9.73e+24 kg)
Radius
1.18x Earth (7,498 km)
This planet: 1.18× Earth radiusEarth: 1× (baseline)
Surface Gravity
1.18x Earth (11.5 m/s²)
Surface Temperature
761 K (488 °C / 910 °F)
Rotation Period
141.8 hours/day (slower than Earth)
This planet: 142 h/dayEarth: 24 h/day

Orbital Environment

Star Type
K-type (Orange)
Distance from Star
0.06 AU (8.51 million km)
Orbital Period
6 days
Time Dilation
Clocks run 5.7 seconds per year slower than deep space — about 8 minutes over a lifetime

Atmosphere

None

Elemental Composition

H - Hydrogen
53.8%
He - Helium
32.3%
O - Oxygen
5.4%

Surface Characteristics

No planet ever formed: too little gravity to bind the light gases - the cloud dispersed into a thin drifting wisp
The TerraForge exoplanet catalog: 5,572 real exoplanets run through the simulation, with a search field and rendered worlds grouped by type

New: The Exoplanet Catalog 🔭

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.

Create your free account

Enter your email and we'll send a 6-digit code — no password needed.
We only keep your email and the username you choose. We never share or sell your email, and we don't send marketing — we use it only to email you a sign-in code. Learn more.

Send feedback

We're still building out the best experience we can — and we'd love your input. Tell us about features you enjoy, ideas you'd like to see, or pain points where something feels off, and we'll know where to look next.

Type