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A Dyson Sphere is a megastructure added in the Utopia expansion, capable of producing massive amounts of energy at the cost of rendering the solar system uninhabitable, except for Habitats. A Ring World is a megastructure added in the Utopia expansion, offering a solar-system sized habitat equivalent to four massive habitable planets.
This is a list of megaprojects, which may be defined in the following categories: . Projects that cost more than US$1 billion and attract a large amount of public attention because of substantial impacts on communities, the natural and built environment, and budgets.
This might also include transformation of the surface conditions, changes in the planetary orbit, and structures in orbit intended to modify the energy balance. Astroengineering is the extension of megascale engineering to megastructures on a stellar scale or larger, [ 3 ] such as Dyson spheres , [ 4 ] Ringworlds , and Alderson disks .
This is a list of the largest cosmic structures so far discovered. The unit of measurement used is the light-year (distance traveled by light in one Julian year ; approximately 9.46 trillion kilometres ).
Stellar engines are hypothetical megastructures whose purpose is to extract useful energy from a star, sometimes for specific purposes. For example, Matrioshka brains have been proposed to extract energy for computation, while Shkadov thrusters would extract energy for propulsion. Some proposed stellar engine designs are based on the Dyson sphere.
The Three Gorges Dam in Hubei, China, has the world's largest instantaneous generating capacity at 22,500 MW of power. In second place is the Baihetan Dam, also in China, with a capacity of 16,000 MW. The Itaipu Dam in Paraguay and Brazil is the third largest with 14,000 MW of power.
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This is a list of buildings and other structures that have been envisioned. The X-Seed 4000 is one of the tallest structures ever conceived. Shown in this image is the Burj Khalifa (828 m (2,717 ft)), tallest structure in the world at the time of completion in 2010 to this year (2025), and the X-Seed 4000 project (4,000 m (13,000 ft)).