One of the "let downs" of ET searches in astronomy is the lack of Dyson spheres around stars. If they exist we should be able to find them with IR telescopes, but none are seen. Kind of disappointing . . . or exciting because we could be the first intelligent species to build one in our corner of the universe.
well how would we see them? Even if they were detectable by IR telsecopes we would have to look for them in blank space as they would block the light from the sun. Unless something I've missed. Other then the deep field image, we generally look where we know something is, as opposed to nothing we know of.
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