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http://www.projectrho.com/public_ht...orted_Apocalypses--Exploding_Stars--SupernovaPaChi2 said:But you dont have a calc with the size of the star and such, dont you?
Novae are impressive but Supernovae are the real deal. A nova will poot off a pathetic one ten-thousandth of its mass in the explosion, with a supernova it is pretty darn close to 100%. The mass will be traveling in all directions at about 30,000 kilometers per second, 10% the speed of light.
Blasted cataclysm will briefly outshine the entire galaxy. In a few months a supernova will emit as much energy as Sol will over its entire lifetime. Type I or type II supernovae emit about 1 Foe (about 1044 joules).
While novae happen multiple times to a star, a given star can only go supernova once. There isn't much left except for a little neutron star or black hole, it is not going to explode again.