The catastrophic, explosive death of a star, accompanied by the sudden, transient brightening of the star to an optical luminosity comparable to that of an entire galaxy.
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A supernova shines typically for several weeks to several months with a luminosity between 2 × 10^8 and 5 × 10^9 times that of the Sun, then gradually fades away. Each explosion ejects from one to several tens of solar masses at speeds ranging from thousands to tens of thousands of kilometers per second. The total kinetic energy, 10^44 joules (2.5 × 10^28 megatons of high explosive), is about 100 times the total light output, making supernovae some of the highest-energy explosions in the universe. Unlike its fainter relative, the nova, a supernova does not recur for the same object.
