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A megastructure is a structure that is extremely large; usually one measured in megameters (thousands of kilometers) or even larger units. Earth has only a few objects that could be considered megastructures, the Great Wall of China being among the most notable. Advanced civilizations could build buildings, cities, or other artificial habitation or industrial complexes so large they dwarf planets, star systems, or even entire galaxies. It is even possible with materials like stringshard to build structures in between universes or larger -verses.

Megadisks and Dyson spheres are examples of megastructures on this Wikia. Feel free to add more!