Supernova

This image is that of what is pretty convincingly percieved to be the earliest recorded Supernova. While obviously not the earliest, 185 AD is a while ago. Chinese astroners were the first to notice it not as a Supernova but as a new star that appeared for a couple of months. X rays taken from two space telescopes, XMM-Newton and Chandra, have shown supernova debris in the same general area. Their composite, false-color view of RCW 86 shows the expanding shell of material glowing in x-rays with high, medium, and low energies shown in blue, green, and red hues.