If aliens existed we could readily see copious surface engineering in galaxies: "The germs of existence [on] earth if they could freely develop themselves would fill millions of worlds in the course of a few thousand years"(Malthus) https://waitbutwhy.com/2014/05/fermi-paradox.html … https://www.centauri-dreams.org/2012/01/23/rethinking-setis-targets/comment-page-1/ …
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Ever read Wei Dai's Fermi Paradox resolution? http://www.weidai.com/black-holes.txt Could all be huddled around black holes immersed in a simulation until the universe's heat death. Doesn't rly explain why they're not geoengineering stars to be less wasteful of energy, but it's a clever idea
Interesting. But the surface area available for radiation is a limiting factor, after that have to increase the temperature of the radiator if they want to convert more energy. Also what material would be strong enough to cross the event horizon of a black hole?
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Oops I misread, the structure doesn't cross the event horizon, it just points at it (it does have to be close enough so that the event horizon cross-section dominates the sky -- don't know if that is possible).
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It would be in orbit around the black hole, so as long as it's not colliding with other objects in orbit it won't cost any energy
End of conversation
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