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Kepler-399 c

Kepler-399 c is a hot super-Earth orbiting a Sun-like star 2,415 ly away. A year there lasts 26.7 days. It was found using the transit method: it dims its star as it passes in front. Note: its mass is estimated from its size.

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Gravity12.62 m/s²1.29× Earth estimated

Size1.43× Earthradius measured

Mass2.63× Earthestimated

Temperature≈ 357 °Cequilibrium temperature measured

Distance2,415 light-yearsfrom the Sun

Its star5,502 Ka Sun-like star

One year26.7 daystime to orbit its star

Discovered2014transit

What it would be like in Worldwalk imagined

Nobody has seen the surface of Kepler-399 c. 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 90 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.

Play Kepler-399 c

Other planets around Kepler-399

Kepler-399 b0.91× Earth Kepler-399 d1.18× Earth

Similar worlds nearby

Kepler-1498 b2,414 light-years Kepler-1082 b2,412 light-years Kepler-1198 b2,423 light-years Kepler-1619 b2,397 light-years Kepler-240 b2,436 light-years Kepler-1501 b2,443 light-years

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.