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So, I read Can a black hole be formed by radiation? and I think I get it. However, I do have a follow-up question. Would it be possible for an interstellar civilization to build huge mirrors around stars to focus enough photons into a small enough space to make a black hole?

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Nathan Ringo
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No, using optical means the radiation flux will always be less that that at the source (the star). Because the flux in a star is not concentrated enough to form a black hole, the same is true from any concentrated radiation that you could get by optical means