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Dyson sphere(swarm, because sphere is misconstrued as solid) is based entirely on known physics and can be made with our existing technology base, just not with our current industrial base.

SETI is a valid research priority.



Unicorns are made entirely with known biology. That doesn't mean funding a search for them is a good use of resources.

SETI is a valid research priority. There's plenty of less speculative signs we can look for.




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