WORLDWALKGJ 357 b
GJ 357 b is a hot Earth-size planet orbiting a red dwarf star 30.8 ly away. A year there lasts 3.9 days. It was found using the transit method: it dims its star as it passes in front.
▶ Land on GJ 357 bFree · plays in your browser
Gravity12.47 m/s²1.27× Earth measured
Size1.2× Earthradius measured
Mass1.83× Earthmeasured
Temperature≈ 245 °Cequilibrium temperature measured
Distance30.8 light-yearsfrom the Sun
Its star3,505 Ka red dwarf
One year3.9 daystime to orbit its star
Discovered2019transit
What it would be like in Worldwalk imagined
Nobody has seen the surface of GJ 357 b. The game builds it from the real numbers above: you land on bare, cratered rock with no air.
- Air: None (bare rock). Surface pressure: almost none.
- A 70 kg explorer would feel like 89 kg.
- A jump that clears 50 cm on Earth would reach about 39 cm.
- With almost no air, a hammer and a feather fall side by side, and sound cannot travel.
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.