Artificial world
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Writers in the fields of science speculation and fiction have created in their works several varieties of artificial worlds.
Such megastructures could have a variety of advantages over natural planets, such as efficient use of solar energy and immense living space, but their construction and/or maintenance would require technologies much in advance of that of 21st-century Earth.
It was often stated, that it is more possible to build a 2-gigaton Dyson sphere than a laser rifle, but still ringworlds etc. are treated in sci-fi as symbol of immense power, often relic of Precursor civilization or symbol of all-powerful future empire.
Examples of artificial worlds include:
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