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. Read our privacy policy.
Entering orbit…
Habitability
33/ 100
Extremely Harsh
Kepler-176 e rendered in TerraForge from its measured mass, orbit and star

Kepler-176 e

Also written Kepler-176e, Kepler 176e, Kepler 176 e

Barren1718 light years awayFound 2016
Mass
0.52 × Earth
Radius
1.45 × Earth
Gravity
0.25 g
Surface (est.)
450 K
Year
51.2 days
From Earth
1,719 ly
Mass
0.52 × Earth
Radius
1.45 × Earth
Gravity
0.25 g
Surface (est.)
450 K
Year
51.2 days
From Earth
1,719 ly

Kepler-176 system

Type
G-type (Yellow (Sun-like))
Temperature
5,295 K
Radius
0.83 ☉
Mass
0.87 ☉
Planets
4
Luminosity
0.394 ☉

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.

Kepler-176 b0.058 AU291 M⊕
Kepler-176 c0.10 AU1.3 M⊕
Kepler-176 d0.16 AU1.7 M⊕
Kepler-176 e0.26 AUYou are here0.5 M⊕
Habitable zone

Star and planets drawn to scale: the star is 63 times as wide as Kepler-176 e, so only its edge is in view. Orbits spaced as in the star system view.

Barren, likely · its density could also fit a sub-Neptune

Kepler-176 e, from the NASA Exoplanet Archive (found 2016). Measured: 0.521 Earth masses, 0.257 AU, a 5295 K G-type star. Composition inferred from a measured bulk density of 0.17x Earth's, larger than even a pure water/ice world of this mass, suggesting a water-rich interior under roughly a 1% hydrogen/helium envelope by mass, with an assumed 24-hour day — rotation cannot be measured for exoplanets.

Surface. Barren rocky surface with unusual elemental composition

Barren
Magnetic FieldLow Activity
Kepler-176 e 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: 0.5x EarthTemperature: 450K

Reading Kepler-176 e’s atmosphere

Dominant elements: H, O, Si, Fe, N, CThis is what a telescope would measure while Kepler-176 e crosses in front of its star: starlight passes through the atmosphere and spreads into a rainbow band. Each dark line marks a wavelength the atmosphere absorbed.Every element absorbs its own signature wavelengths — hydrogen always darkens the same two spots, calcium another pair, and so on. Astronomers match the lines in a real spectrum against a library of these signatures to say what an atmosphere is made of, light-years away, without ever visiting. A deeper line generally means more of that element is present.Kepler-176 e sits about 1719 light-years away, found by the transit method. Most catalogued distances trace back to parallax: as Earth orbits the Sun, a nearby star appears to shift very slightly against the distant background stars, and the size of that shift gives its distance directly.
Further reading
ExoplanetsSara Seager (editor)The field's standard reference: how planets are found, how they form, and what their atmospheres are made of.The Planet FactoryElizabeth TaskerHow planets are made, and why so few of them come out like Earth.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.
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 ScoreExtremely Harsh
33
Contributing Factors
temperature12
Extremely hot - hostile to known life forms
atmosphere70

Thin CO₂ and nitrogen atmosphere

Nitrogen atmosphere provides protection but not breathable
water57
Abundant water - likely as steam (low gravity lets water escape to space)
magnetic Field100
Magnetic field provides radiation protection
geology60
Some geological activity provides slow nutrient cycling
Organic Chemistry80
Core organic elements (CHNO) present
rotation100
Optimal rotation period - balanced day/night cycle, moderate weather, and good heat distribution

Physical Properties

Mass
0.52x Earth (3.11e+24 kg)
Radius
0.80x Earth (5,126 km)
This planet: 0.80× Earth radiusEarth: 1× (baseline)
Surface Gravity
0.80x Earth (7.9 m/s²)
Surface Temperature
450 K (177 °C / 351 °F)
Rotation Period
24.0 hours/day
This planet: 24 h/dayEarth: 24 h/day

Elemental Composition

A dark ringed planet hanging over the horizon of a rocky moon, its rings lit by a distant sun

New: Stand on Your Moons 🌒

A planet's surface view isn't the only ground any more. Press the surface button on a planet with moons and it asks where to stand: the planet itself, or any moon still in orbit, each tagged with what it became — ocean, ice, carbon, volcanic. Every moon gets its own ground and sky from its own physics: airless rock under a black sky, ice cracked by geysers over a hidden sea, sulfur plains shaking with eruptions, or orange haze you can't see the sun through. And hanging over the horizon, there's the planet you built.

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. Read our privacy policy.

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
Idea
Bug
Pain point
Other