Mega structures and
Mega constructions of the World
In science fiction and speculative (or exploratory) engineering, a mega
structure is an enormous self-supporting artificial construct. The
definition is often informal and varies from source to source, but generally
requires at least one dimension to be in the hundreds of kilometers. Other
criteria such as rigidity or contiguousness are sometimes also applied, so
large clusters of associated smaller structures may or may not qualify. The
products of megascale engineering or astroengineering are megastructures.
Megastructures are also an architectural concept popularized in the 1960s
where a city could be encased in a single building, or a relatively small
number of buildings interconnected together.
Megastructures often play a part in the plot or setting of science fiction
movies and books.