Megastructures

hypothetical megastructure, originally described by Freeman Dyson

An arcology or vertical city is a hypothetical mixed-use megastructure featuring high population density with the goal of autarky from the outside environment. The term was coined in 1969 by architect Paolo Soleri as a portmanteau of "architecture" and "ecology." Soleri believed that a completed arcology would provide space for a variety of residential, commercial, and agricultural facilities while minimizing individual human environmental impact.

thumb|An outline map of the various hydroelectricity and land reclamation projects combined in Atlantropa

right|thumb|A depiction of a planetwide city, which the artist considers suitable for both Trantor, a fictional ecumenopolis from Isaac Asimov's Galactic Empire, and [[Coruscant in the Star Wars franchise.]]

envisioned building

space habitat

space settlement concept proposed by American physicist Gerard K. O'Neill

hypothetical computer system

theoretical tunnel that would span the Atlantic Ocean

thumb|300px|The Great Wall of China, at long, is an ancient era megaproject. This picture was taken near Beijing in February 2005.

theoretical megastructure

proposed system for launching objects into orbit

proposed momentum exchange tether

concept of an enormous artificial ring placed around the Earth that rotates at an angular rate that is faster than the rotation of the Earth

American documentary television series

hypothetical artificial astronomical megastructure

spacecraft launching method

thumb | 220x124px | right | alt= This is an image that shows StarTram launching a rocket. | StarTram launching a rocket thumb|right|240px|Hypothetical StarTram spaceport. The launch tube stretches into the distance to the east on the right (eventually curving up many kilometers away), next to the power plant which charges the Superconducting magnetic energy storage|SMES. RLVs return to land on the runway.

form of megascale engineering for the engineering of spacecraft

hypothetical object theorized to be a potential mode of time travel

concept in science fiction

proposed form of a tower extending into space

art project and book by Christian Waldvogel

form of exploratory engineering concerned with the construction of structures on an enormous scale

human-made things that can be seen from space