Megastructures

Although extraterrestrial megastructures could take any number of forms, the most frequently discussed type of megastructure is the Dyson sphere. Named for Freeman Dyson, who popularized the notion in a 1960 paper, Dyson structures partially or entirely surround a star for the purpose of harvesting its energy output. Dyson spheres and other Kardashev Type 2 megastructure projects are theorized as a response to the escalating energy requirements of an advanced planetary civilization.

As a civilization expands, it may build multiple Dyson structures, utlimately creating a relative darkening effect as visible starlight is depleted in its vicinity. Such an effect is known... More

Although extraterrestrial megastructures could take any number of forms, the most frequently discussed type of megastructure is the Dyson sphere. Named for Freeman Dyson, who popularized the notion in a 1960 paper, Dyson structures partially or entirely surround a star for the purpose of harvesting its energy output. Dyson spheres and other Kardashev Type 2 megastructure projects are theorized as a response to the escalating energy requirements of an advanced planetary civilization.

As a civilization expands, it may build multiple Dyson structures, utlimately creating a relative darkening effect as visible starlight is depleted in its vicinity. Such an effect is known as a Fermi bubble or Fermi void, named for physicist Enrico Fermi.

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Detectability

  • Partial Dyson structures could be detectable when transiting their host star, although dips in the star's luminosity can be caused by a myriad of obstructions of non-technological origin.
  • A complete or unbroken Dyson sphere would emit no visible light whatsoever and thus be invisible in the optical range of the spectrum, although it could still potentially be detected by its heat radiation.

Research

1-Nov-2021
26-Oct-2021
22-Sep-2021
20-Sep-2021
14-Aug-2021
Monthly Notices of the Royal Astronomical Society
20-Jul-2021
15-Jul-2021
8-Jul-2021
Acta Astronautica
29-Jun-2021
Monthly Notices of the Royal Astronomical Society
14-Jun-2021
International Journal of Astrobiology
(1-Nov-2021)
(26-Oct-2021)
(22-Sep-2021)
(20-Sep-2021)
(14-Aug-2021)
Monthly Notices of the Royal Astronomical Society
(20-Jul-2021)
(15-Jul-2021)
(8-Jul-2021)
Acta Astronautica
Tiger Yu-Yang Hsiao, Tomotsugu Goto, Tetsuya Hashimoto et al. (29-Jun-2021)
Monthly Notices of the Royal Astronomical Society
(14-Jun-2021)
International Journal of Astrobiology