This is the first map of radioactivity in a supernova remnant, the blown-out bits and pieces of a massive star that exploded. The blue color shows radioactive material mapped in high-energy X-rays ... more 
This is the first map of radioactivity in a supernova remnant, the blown-out bits and pieces of a massive star that exploded. The blue color shows radioactive material mapped in high-energy X-rays using NASA's NuSTAR space observatory. less 
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SPACE.com | Photo By NASA/JPL-Caltech/CXC/SAO
Wed, Feb 19, 2014 1:30 PM EST