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Jack comments on Max Tegmark on our place in history: "We're Not Insignificant After All" - Less Wrong
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Might we be able to see them if they went in front of galaxies or other highly luminous body?
Come to think of it, wouldn't they look a lot like black holes?
Not really. The black hole might have hawking radiation it should also gravitationally lens the surroundings more than a dyson sphere.
It might also have an accretion disc.