Enceladus
Ocean water erupts fast enough to escape entirely, feeding Saturn's E ring. You can sample the inside of this world without landing on it.
Surface conditions on Enceladus
Every figure below is tagged with where it came from. Measured means an instrument read it on or at the body; modeled means it was computed and never directly observed.
What it would take to settle Enceladus
No world off Earth is habitable — the honest habitable fraction of every surface here is zero. What can be answered is how far each one sits from Earth along the seven axes a habitat has to buy its way out of. Enceladus scores 54.8 out of 100, on 100% coverage of the axes. The single worst axis here is pressure (1e-11 bar (vacuum)); the one that most sets Enceladus apart from the other thirteen is available energy.
Below the Armstrong limit (0.062 bar) body fluids boil at body temperature — the difference between needing a mask and needing a pressure vessel. Above 1 bar the problem inverts into containment, and Venus at 92 bar has never let a lander live two hours.
Delta-v sets what a launch costs; cruise time sets how much consumable, shielding and crew patience each kilogram of payload drags with it.
Both directions cost power continuously. A cold world burns reactor output to stay warm; a hot one has no cold sink to dump heat into at all.
Past the asteroid belt solar panels stop being an option and a settlement needs fission, which means importing fuel.
Who has been to Enceladus
Never landed on, but Cassini sampled its ocean by flying through a plume at 100 km altitude — the only time a spacecraft has tasted an alien ocean.
Unprotected survival: Seconds.
A global subsurface ocean in contact with a rocky seafloor. Cassini flew through the plumes and found salts, silica grains and molecular hydrogen — the chemical signature of hydrothermal vents.
The named places on Enceladus
The IAU has approved 85 names on Enceladus, each drawn from a theme the naming committee chose for this world. Every name in the scene above is one of them, placed at its catalogued coordinates.
Sources
- Cassini ISS — Cassini colour mosaic, 100 m/px (NASA Trek / USGS Astrogeology)
- IAU / USGS Gazetteer of Planetary Nomenclature
- NASA — Enceladus
Imagery is public-domain NASA/USGS mission data, streamed live from NASA Trek as a plate-carrée tile pyramid and draped on our own sphere — no third-party globe library and no cached copy of anyone else's map.