The immense void of space provides unparalleled opportunities for exploration, exploitation, and colonization. Worlds and other natural bodies are actually pretty far apart from each other, even within star systems. Artificial outposts, waystations and other structures will be needed by any space-faring culture.
| SATELLITES | Workhorses of the space age |
| SPACE STATIONS | Homesteads on the High Frontier |
| SPIN GRAVITY HABITATS | Centrifugal gravity. |
| ORBITAL HOT LABS | Dangerous experiments in space. |
| SOLAR POWER SATELLITES | Tapping the Sun from orbit. |
| STATITES | Hovering at orbital altitudes |
| SPACE-BASED SUNSHADES | Cooling off Earth. |
| SPACE COLONIES | Miniature worlds in the void |
| LAGRANGE POINT STRUCTURES | Moving in to the Earth-Moon neighborhood |
| GRAVITY LENS STRUCTURES | The Sun as telescope |
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