Nearby Type iii (galaxy-spanning) Kardashev supercivilizations would have high mid-
infrared (MIR) luminosities. We have used the Wide-field Infrared Survey Explorer (WISE) to
survey $\sim 1\times {{10}^{5}} $ galaxies for extreme MIR emission, 1× 10 3 times more
galaxies than the only previous such search. We have calibrated the WISE All-sky Catalog
pipeline products to improve their photometry for extended sources. We present 563
extended sources with $| b|\geqslant 10$ and red MIR colors, having visually vetted them to …

The WISE and Spitzer large-area surveys of the mid-infrared sky bring a new opportunity to
search for evidence of the energy supplies of very large extraterrestrial civilizations. If these
energy supplies rival the output of a civilization's parent star (Kardashev Type II), or if a
galaxy-spanning supercivilization's use rivals that of the total galactic luminosity (Type III),
they would be detectable as anomolously mid-infrared-bright stars and galaxies,
respectively. We have already performed the first search for this emission from Type III …