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A Dyson Sphere is a hypothetical construct of a star purposely cloaked by athick swarm of broken-up planetary material to better utilize all of thestellar energy. A clean Dyson Sphere identification would give a significantsignature for intelligence at work. A search for Dyson Spheres has been carriedout using the 250,000 source database of the IRAS infrared satellite whichcovered 96% of the sky. The search has used the Calgary database for the IRASLow Resolution Spectrometer (LRS) to look for fits to blackbody spectra.Searches have been conducted for both pure (fully cloaked) and partial DysonSpheres in the blackbody temperature region 100 < T < 600 K. When other stellarsignatures that resemble a Dyson Sphere are used to eliminate sources thatmimic Dyson Spheres very few candidates remain and even these are ambiguous.Upper limits are presented for both pure and partial Dyson Spheres. Thesensitivity of the LRS was enough to find Dyson Spheres with the luminosity ofthe sun out to 300 pc, a reach that encompasses a million solar- type stars.

IRAS-based whole-sky upper limit on Dyson Spheres