A new study recommends looking for Dyson Spheres that are smaller, orbit closer to their suns, and might still be under construction.
“Traditionally, we look for infrared emission from stars to see if they have orbital material warm from the starlight,” Wright told Universe Today via email. “If it is not the kind of star that typically has material orbiting it, then we can look more closely to see if the material looks like dust or something else.
Dyson acknowledged that capturing a star’s energy was merely one possible motivation for building such a megastructure. For example, several SETI researchers have proposed that a Dyson structure could be used as a stellar engine that could move stars or as a massive supercomputer . Like its namesake, a Matrioshka Brain has a nested structure, where the inner layer absorbs direct sunlight and the outer layers exploit the waste heat from the inner layer to optimize computational efficiency.
He concluded that there is little to no advantage in creating nesting shells and that the optimal use of mass would favor smaller, hotter Dyson spheres. Furthermore, he indicated that there would be observable differences between “complete” Dyson Spheres and those still in progress. As Wright explained:
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