Supernova/Definition

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https://en.citizendium.org/wiki/index.php?title=Supernova/Definition&printable=yes
A definition or brief description of Supernova.

An astronomical object exploding to a brightness similar to that of an entire galaxy. Caused by a catastrophic explosion of either a white dwarf system or an aged star about five times the size of the sun, which occurs when the star collapses; a neutron star or a black hole may be formed as a result, or the explosion results in no remaining compact object.

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