This is a wide-field view of the region around Tycho's Supernova showing the expanding bubble of the supernova explosion. The colours in this Chandra X-Ray image of the hot bubble show different X-ray energies, with red, green, and blue representing low, medium, and high energies, respectively. (The image is cut off at the bottom because the southernmost region of the remnant fell outside the field of view of the Chandra camera.)

Credit: NASA/ESA, CXO and P. Ruiz-Lapuente (University of Barcelona)