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A megadisk is a galactic megastructure shaped similarly to an Alderson disk but significantly larger[1], constructable with significant effort by a Type 4.0 civilization and routinely by Type 5.0 civilizations and above. They have a radius of 10 light years and a central hole with a radius of one light year. Inside the central hole is a quasar, which provides heat and light to the megadisk. It is habitable on both sides; the mass of the structure of the megadisk provides gravity, as well as artificial gravity.

They have a mass of 11 galactic masses and require approximately 1054 joules of energy to build.

References

  1. http://www.xenology.info/Xeno/19.2.5.htm

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