Megastructure

Megastructures are also an Architectural concept popularized in the 1960's 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.

EXISTING MEGASTRUCTURES

There are structures on Earth that may be considered megastructures, such as

The Great Barrier Reef , at 2,000 Km in length

The Great Wall Of China is a human-built megastructure, 6,700 km in length.

Networks of roads or railways, and collections of buildings (cities and associated suburbs), are usually not considered megastructures, despite frequently qualifying based on size. However, an Ecumenopolis might qualify.

THEORETICAL MEGASTRUCTURES

Stellar scale

Alderson Disk

Dyson Sphere (also known as a Dyson Shell )

Matrioshka Brain

Shkadov Thruster

Stellar Engine

Planetary scale

Globus Cassus

Orbital structures

Bernal Sphere (with a maximum diameter of 16 kilometers)

Stanford Torus (diameter just under 1.7 kilometers)

O'Neill Cylinder

Trans-orbital structures

Lofstrom Loop

Skyhook

Rotovator

Space Elevator

FICTIONAL MEGASTRUCTURES

Stellar scale

Larry Niven 's series of novels about his '' Ringworld '' originated the concept.

The Dyson Shell has appeared in many works of fiction, including the '' Star Trek '' universe.

In the Manga '' Blame! '' the Megastructure is a vast and chaotic complex of metal, concrete, stone, etc, that covers the whole Earth and assimilates even the Moon. There is even a clue by the end of this manga that suggests the assimilation of Jupiter. The Megastructure continues to expand by itself, being built by robots called Builders . The whole history of the manga takes place deep inside of the structure, where there is no sea or sky, and the characters find themselves climbing up thousand of kilometers of labyrinths searching for Net Terminal Genes . It has been suggested by Tsutomu Nihei himself that the Megastructure is actually a growing Dyson Sphere of gargantuian proportians.(Speculated to be roughly the size of Jupiter s planetary orbit.)

Planetary scale

Death Star

Buster Machine III from '' Gunbuster ''.

Culture Orbital

In '' The Hitchhiker's Guide To The Galaxy '' series, Earth, as well as other planets, were artificial megastructures. Earth was intended to function as a gigantic computer, and was built by a race of beings who made their living by manufacturing other planets.

In the Transformers universe, Unicron is a recurring megastructure that resembles a giant planet with large Mandibles that can transform into a gigantic humanoid robot.

The Star Forge from Knights Of The Old Republic

The seven '' universe are 10,000 km wide rings designed to wipe out all sentient life in the Milky Way Galaxy .

In the Robotech Sentinels novels, Haydon IV is an artificially constructed cyber-planet with android citizens.

MEGASCALE STRUCTURES

Structures that might not be classified as "''Megastructures''" because they do not meet the requirements, but are indeed "''Mega''" sized structures/constructions.

Stellar scale

Dyson Bubble - Collection of separate constructions.

Dyson Swarm - Collection of separate constructions.

	CATEGORIES ABOUT MEGASTRUCTURE

	megastructures

	science fiction themes

	exploratory engineering

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Megastructure