Mosaicked CO (Spitzer 4.5 micronmeters, green), Silica dust (Spitzer IRS 21 micronmeters, red), X-ray (Chandra, blue) maps. CO molecules are embedded in ten million degree gas; AKARI spectra have now allowed us to identify the synchrotron-subtracted Spitzer IRAC band 2 image at 4.5 micronmeters as a map of the CO distribution in Cas A. J. Rho/NASA/JPL-Caltech/CXC for image; J. Rho/JAXA/SETI institute for spectra