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mfb- t1_j6botff wrote

Reply to comment by CubanHermes in Is there an upper limit to structure size in a vacuum? Could a sufficiently advanced civilisation build a galaxy sized structure in space or would it become too massive and collapse in on itself? by CubanHermes

You need cooling, not heating. The heat loss scales with the surface of the structure, but heat production scales with the volume (if we just scale everything up). The volume grows faster than the surface. Even the ISS needs radiators already.

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