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A computer the size of a star would nest Dyson spheres like Russian dolls

Ellsworth Toohey
Jun 26, 2026
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Fanghong assumed (based on copyright claims). / CC BY-SA 3.0 (via Wikipedia)

In 1997, Robert J. Bradbury proposed the matrioshka brain — a hypothetical megastructure of “immense computational capacity powered by a Dyson sphere.” The name comes from matryoshka nesting dolls. The idea: wrap a star in multiple concentric Dyson spheres, each one computing wi…

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