RCW 86 is the oldest recorded supernova known. This image combines X-ray data (in blue and green) from the Chandra X-ray Observatory and the XMM-Newton telescope with infrared observations (in yellow and red) from Spitzer and the Wide-field Infrared Survey Explorer. Chinese observers saw the supernova blast in A.D. 185; the remnant now spans about 85 light-years and appears roughly the width of the Full Moon on the sky.