A megastructure is a very large artificial object, although the limits of precisely how large vary considerably. Some apply the term to any especially large or tall building. Some sources define a megastructure as an enormous self-support ...

はくちょう座の中にある恒星「kic 8462852」は、不規則に光が弱まることが知られており、地球外生命体が作る構造物によって光が遮断されている ...

Megastructure is what it sounds like: a vastly scaled edifice that can contain potentially countless uses, contexts, and adaptations. Theorized and briefly experimented with in built form in the 1960s, megastructures almost as quickly went out of fashion