How Stars Die - Remains of Cassiopeia after a supernova explosion Canvas Print

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This is digitally enhanced image of the remains of a star called Cassiopeia A, after a supernova explosion. It is a false-color composite image made up of images obtained by NASA's Chandra and NuSTAR telescopes (NuSTAR is short for Nuclear Spectroscopic Telescope Array). It shows the first-ever map of radioactive material in the remains of a supernova. The red and green colors in this image represent X-ray emissions detected by Chandra coming from iron and silicon/magnesium produced in the explosion, while the blue color shows NuSTAR's map of titanium formed in the core of the explosion. The radioactive titanium-44 was produced in the star's core as it collapsed to a neutron star or black hole. The energy released in the supernova blew off the star's outer layers, and the debris from this explosion has been expanding outward ever since at 3,100 miles per second.

A supernova is the cataclysmic death of a star, which is very luminous and produces a burst of radiation that often br...

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