Megacivilization

A megacivilization is a propounded theory regarding a super-advanced civilization living within the accretion disk of a celestial body, typically a star. The theory is not generally supported, although a few scientific papers, mostly from the 1990s, say that it's possible. One such paper, "Accretion disk civilization 1: Habitable zone around accretion disks at galactic nuclei" by J. Fukue, notes that the density of stars and planets in the accretion disk is expected to be high, and ponders what type of life and planets might develop there. Fukue's second paper is much more experimental, alleging that civilizations could harness the energy of an accretion disk using a "photon floater". An excerpt from Fukue's second paper follows:
:An accretion disk surrounding a supermassive black hole at the active galactic nuclei radiates tremendous energy. In order to utilize energy of the accretion disk system, the author investigates the configuration and stability of a floating platform - photon floater - above the accretion disk, which is supported by the radiation pressure of the disk radiation. In the case of the far-floater, which is located far from the disk, there exists a critical floating angle, where the gravitational force of the central black hole is balanced with radiation pressure. In the case of the near-floater, which is located very close to the disk, there exists a critical floating height, where the gravity is balanced with radiation. It is demonstrated that this floating height is dynamical stable. Finally, in the case of the axis-floater, which is located on the axis of the disk, the photon floater is unstable.<ref name="autogenerated1"/>
It has even been proposed that the centre of our galaxy, the Milky Way, could support such a megacivilization.

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