An image from Japan's Suzaku X-ray observatory shows RXJ1713.7-3946, which is a supernova remnant—the gaseous remnant of a massive star that exploded. The remnant is about 1,600 years old. The contour lines show where gamma-ray intensity is highest, as measured by the High Energy Stereoscopic System (HESS) in Namibia. Credit: JAXA/Takaaki Tanaka/HESS
