Water World Magnetic Field Low Activity
Why is this a Water World? Your planet has abundant oxygen (52.2%) and hydrogen (27.5%), creating extensive water coverage while in the habitable temperature zone. Water worlds have deep global oceans covering most or all of their surface. They form when planets have high water content and orbit in the habitable zone.
✓ Oxygen: 52.2% + Hydrogen: 27.5% (water-forming elements) ✓ Temperature: 303K (habitable range) ✓ Distance: 267.30 AU (habitable zone)
Habitability Score Extremely Harsh
Contributing Factors water 89
Abundant water (low gravity lets water escape to space) geology 60
Some geological activity provides slow nutrient cycling rotation 10
Near tidally locked - one hemisphere perpetually scorched, other frozen, narrow habitable twilight zone only Organic Chemistry 20
Limited organic chemistry potential atmosphere 40
Nitrogen-oxygen atmosphere - breathable and protective (partially stripped by slow rotation) temperature 100
Optimal temperature range for liquid water and life magnetic Field 100
Magnetic field provides radiation protection Physical Properties Mass
0.60x Earth (3.58e+24 kg) Radius
0.84x Earth (5,374 km) This planet: 0.84× Earth radius Earth: 1× (baseline)
Surface Gravity
0.84x Earth (8.3 m/s²) Surface Temperature
303 K (30 °C / 86 °F) Rotation Period
20.0 hours/day (faster than Earth) This planet: 20 h/day Earth: 24 h/day Orbital Environment Star Type
O-type (Blue Supergiant) Distance from Star
267.30 AU (40 billion km) Orbital Period
797.9 years Atmosphere Nitrogen and oxygen with water vapor, mild greenhouse effect
Surface Characteristics Vast oceans covering most of the surface, scattered islands or archipelagos Closest Real Exoplanet Orbiting Kepler-138 Yours Kepler-138 e Mass 0.60 × Earth 0.43 × Earth Radius 1.03 × Earth 0.80 × Earth Density (composition) 3.00 g/cm³ 4.68 g/cm³ Temperature 303.2 K 292.0 K Starlight received 1.40 × Earth 1.73 × Earth Star temperature 35,000 K 3,841 K
Discovered 2022 via transit timing variations · 218 light-years away Source: NASA Exoplanet Archive Browse all 5,568 real exoplanets Learn more about exoplanets Moons
Moon 1 stable 0.010% - 13.0 radii
Small and distant: a quiet, stable companion.
Tidal braking locked the planet to its moon: one face forever moonward.
Moon 2 stable 0.010% - 6.3 radii
Small and distant: a quiet, stable companion.
Moon 3 stable 0.010% - 17.9 radii
Small and distant: a quiet, stable companion.
+4 chemistry: tidal pools cycle wet and dry - a boost for prebiotic chemistry