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Wei_Dai comments on [Link] Study: no big filter, we're just too early - Less Wrong Discussion
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Years ago I had the idea that advanced civilizations can radiate waste heat into black holes instead of interstellar space, which would efficiently achieve much lower temperatures and also avoid creating detectable radiation signatures. See http://www.weidai.com/black-holes.txt and my related LW post.
It's an interesting idea.
Stable black holes seem difficult to create though - requires alot of mass. Could there be a shortcut?