Megastructures are artificial constructs so huge that they challenge our preconceptions of size.
A megastructure, by definition, has to be a single, unified structure. A modern city may be huge in scale, but its is actually composed of many thousands of individual buildings, all built at different times for different purposes. The Great Wall of China may be considered a megastructure, however, as it is a single complete structure with one dedicated purpose.
Megastructures may be intelligent life's ultimate expression of existence, as they challenge the very scale of the universe.
| MEGASHIPS | Ocean-going behemoths. |
| ARTIFICIAL ISLANDS | New ocean real estate. |
| ARCOLOGIES | City-sized buildings. |
| MEGACITIES | Super-Sized urban environments. |
| SPACE TETHERS | Orbital cables miles long |
| SPACE FOUNTAIN | Keeping space stations aloft by shooting them with millions of hypersonic bullets. |
| SPACE ELEVATOR | A 40,000 mile long railroad track right into space. |
| SPACE COLONIES | Miniature world in the Great Dark. |
| HOLLOWED ASTEROID/COMET | Large colonies on minor bodies. |
| PLANETARY HALO | Artificial planetary rings. |
| ROSETTES | Multiple celestial objects in the same orbit |
| BALLOON WORLDS | Planet-sized hollow spheres. |
| RINGWORLDS | Cosmic rings spinning in the void. |
| DYSON SPHERES | Englobing entire stars. |
| XEELEE RING | A loop of cosmic string ten million light years across. |
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