Such megastructures could have a kind of benefits across natural planets, such as effective apply of solar energy & huge lebensraum, however their construction and/or maintenance would expect technologies very much ahead of that of 21st-century Globe.

It was typically stated, that these are additional conceivable to build the Two-gigaton Dyson sphere than optical maser rifle, however however ringworlds etc. come treated around sci-fi when symbol of huge power, typically relic of Precursor civilization or symbol of a lot-almighty first empire.

Examples of unreal worlds include: Culture Orbitals Dyson spheres Globus Cassus Planetoids Ringworld