Using NASA’s Chandra X-ray Observatory, astronomers have discovered the first X-ray evidence of a supernova shock wave breaking through a cocoon of gas surrounding the star that exploded. This composite image of UGC 5189A shows X-ray data from Chandra in purple and optical data from Hubble Space Telescope in red, green and blue. SN 2010jl is the very bright X-ray source near the top of the galaxy (X-ray image: NASA / CXC / Royal Military College...
