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A '''Supernova''' (plural: supernovae or supernovas) is a stellar explosion. They are extremely luminous and cause a burst of [[radiation]] that may briefly outshine an entire [[Milky Way|galaxy]] before fading from view over several weeks or months. During this short interval, a supernova can radiate as much energy as the [[Sol|Sun]] could emit over its life span. The explosion expels much or all of a star's material at a velocity of up to a tenth the speed of light, driving a shock wave into the surrounding interstellar medium. This shock wave sweeps up an expanding shell of gas and dust called a supernova remnant.<ref>[[Wikipedia:Supernova|'''Wikipedia''': ''Supernova'']]</ref> | A '''Supernova''' (plural: supernovae or supernovas) is a stellar explosion. They are extremely luminous and cause a burst of [[radiation]] that may briefly outshine an entire [[Milky Way|galaxy]] before fading from view over several weeks or months. During this short interval, a supernova can radiate as much energy as the [[Sol|Sun]] could emit over its life span. The explosion expels much or all of a star's material at a velocity of up to a tenth the speed of light, driving a shock wave into the surrounding interstellar medium. This shock wave sweeps up an expanding shell of gas and dust called a supernova remnant.<ref>[[Wikipedia:Supernova|'''Wikipedia''': ''Supernova'']]</ref> | ||