<a href="http://home.fnal.gov/~carrigan/infrared_astronomy/Fermilab_search.htm" rel="nofollow">http://home.fnal.gov/~carrigan/infrared_astronomy/Fermilab_s...</a><p>The link above is to a fermi lab program to look for Dyson spheres. The Matrioshka brain is a subset of the Dyson sphere. Something made famous, unfortunately, by Trekkers.