WORLDWALKKepler-138 d
Likely a water-rich world; water may make up a large share of its volume, possibly as a hot, steamy envelope.
▶ Land on Kepler-138 dFree · plays in your browser
Gravity9.04 m/s²0.92× Earth measured
Size1.51× Earthradius measured
Mass2.1× Earthmeasured
Temperature≈ 72 °Cequilibrium temperature measured
Distance218 light-yearsfrom the Sun
Its star3,841 Ka red dwarf
One year23.1 daystime to orbit its star
Discovered2014transit
What it would be like in Worldwalk imagined
Nobody has seen the surface of Kepler-138 d. The game builds it from the real numbers above: you land on hot, steamy shores of a water world.
- Air: H₂O (water vapor) steam, N₂ (nitrogen) · a guess. Surface pressure: 8.8 bar.
- A 70 kg explorer would feel like 65 kg.
- A jump that clears 50 cm on Earth would reach about 54 cm.
- The air is about 9 times denser than at sea level on Earth: thick enough to slow a falling rock.
Pack the right suit. Choose 3 of 6 modules (cooling, heating, pressure hull, extra oxygen, radiation shield, jetpack), complete 3 surveys and get back to the lander before your oxygen runs out.
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Sizes, masses, temperatures and orbits come from the NASA Exoplanet Archive (Planetary Systems Composite table). Values marked estimated are calculated from the other measurements; the surface and air are imagined for the game.