Measured on the far side by Chang'e-4 — about 200 times the dose you take standing on Earth, and 2.6 times what a crew takes on the ISS.
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.
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. The Moon scores 29.1 out of 100, on 100% coverage of the axes. The single worst axis here is pressure (1e-15 bar (vacuum)); the one that most sets The Moon apart from the other thirteen is pressure.
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.
Shielding is mass, and mass is the single most expensive thing to move. Above roughly 1 mSv/day a surface habitat has to be buried.
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.
Nobody has ever measured long-term human health at any gravity between 0 and 1 g. Below about 0.1 g, anchoring anything — including yourself — becomes the design driver.
Six crewed landings, twelve people, the last in December 1972. Nobody has been back.
Unprotected survival: About 15 seconds of useful consciousness before hypoxia.
Ice in permanently shadowed polar craters — LCROSS impact plume 2009, Chandrayaan-1 M3 spectra, SOFIA detection in sunlit soil 2020.
The IAU has approved 9,086 names on The Moon, 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.
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.
