WORLDWALKK2-18 b
A candidate 'hycean' world: possibly an ocean under a hydrogen-rich sky. JWST detected methane and carbon dioxide; claims of a biosignature gas are disputed. It sits where a planet could be warm enough for liquid water, in the so-called habitable zone.
What it would be like in Worldwalk imagined
Nobody has seen the surface of K2-18 b. The game builds it from the real numbers above: you land on a deep ocean under a hydrogen sky.
- Air: Rich in H₂ (hydrogen), H₂O (water vapor) · a guess. Surface pressure: 12 bar.
- A 70 kg explorer would feel like 111 kg.
- A jump that clears 50 cm on Earth would reach about 31 cm.
- The air is about 12 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.