An international team of astronomers using NASA’s Nuclear Spectroscopic Telescope Array (NuSTAR) has revealed how stars blow up in supernova explosions. This image shows Cassiopeia A, a remnant that blew up as a supernova more than 11,000 years ago, leaving a dense stellar corpse and its ejected remains. Image credit: Lawrence Livermore National Laboratory. A supernova is the cataclysmic death of a star, which is extremely luminous and causes...