Quote:
Originally Posted by Phantasm
Every solid body that's obtained a hydrostatic equilibrium classified as a terrestrial planet, moon, or dwarf planet in the system has at least one pressure/environmental dome colony, save for Venus. In addition, there are O'Neill cylinder and/or Stanford torus stations in every L4 and L5 position for the major planets, and possibly a few of the minor ones.
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This is jumping back a bit, to Question 5, but I stumbled across this handy page:
List of gravitationally rounded objects of the Solar System
It gives 38 terrestrial objects for people to sit on.
Also useful:
List of Solar System objects by size