WORLDWALKGJ 3998 d
GJ 3998 d is a temperate water-rich world orbiting a red dwarf star 59.2 ly away. A year there lasts 41.8 days. It was found using the radial velocity method: it makes its star wobble. Its temperature could allow liquid water, which makes it a habitable-zone candidate, not a confirmed habitable world. Planets this size may be wrapped in thick gas; the game imagines it as a solid or water world you can walk on. Note: its size is estimated from its mass, only a minimum mass is known. 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 GJ 3998 d. The game builds it from the real numbers above: you land on a deep global ocean with rocky islands.
- Air: N₂ (nitrogen), H₂O (water vapor) · a guess. Surface pressure: 7.1 bar.
- A 70 kg explorer would feel like 78 kg.
- A jump that clears 50 cm on Earth would reach about 45 cm.
- The air is about 7 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.