Megastructures of type-III civilizations orbiting galaxies

TL;DR

This paper explores the theoretical construction and detectability of galaxy-scale megastructures by advanced Type-III civilizations, analyzing their placement, energetic feasibility, and observational signatures around galaxies.

Contribution

It introduces a detailed analysis of the conditions, placement, and detectability of galaxy-scale megastructures by hypothetical advanced civilizations.

Findings

Estimated the orbital distance for megastructures around Milky Way-like galaxies.

Showed energetic feasibility of placing massive structures in galactic orbits.

Discussed potential observational signatures of such megastructures.

Abstract

The article 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, we estimated the corresponding distance from its center at which a solar mass megastructure would need to be placed. We 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.