Megastructures of Type-III Civilizations Orbiting Galaxies

ZAZA N. OSMANOV

2026.79.0366

DOI https://doi.org/10.59332/jbis-079-10-0366

The paper discusses the possibility of a Type-III extraterrestrial civilization constructing megastructures around a galaxy in regions where the galactic radiation becomes indistinguishable from the CMB radiation. For a Milky Way–like galaxy, the author estimated the corresponding distance from its center at which a solar mass megastructure would need to be placed. The author also showed that, from an energetic standpoint, placing such a massive object into orbit poses no fundamental difficulties. The detectability of the megastructure was also addressed.

Keywords: Megastructures, Type-III civilization, Technosignatures, Cosmic Microwave Background, Microlensing